treydwg
64s^2+144s=-81 can anyone help on this one. Solving for s
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marsss
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64s^2+144s+81=0
(8s+9)^2=0
8s+9=0
8s=-9
s=-9/8
treydwg
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hmmm?
treydwg
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@marsss Thank you for the setup
godorovg
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I think this problem is quadtradic
treydwg
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i believe it is too
marsss
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@godorovg you're a genius :)
marsss
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@treydwg you're too :)
treydwg
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thanks lol
treydwg
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so the solution set would be
treydwg
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I working on it
godorovg
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in this problem the first clue is being = 0 usally says Quad needs to be used.
treydwg
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What is the easier way of working out qUADRATIC without using the quad formula?
godorovg
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64^2 is a peferct square so that always tells that this will invole in a square root to slove
godorovg
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you could use a^2+B^2=c^2 as well
treydwg
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So I got -1.125, -1.125. Can I write -1.125^2. Or is this considered incorrect?
godorovg
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yes you can do that with 1.125^2 if you used the Quad form you would plus ninus which is what the problem is asking for..
treydwg
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Ok i just wrote it twice. lets see if it counts it correct?
godorovg
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treydwg first thing to know in this problem 64s^2+144s+81=0 all of the numbers are perfect squares. what that means taking the square root will be a number for example you take square root of 81 which is, we can check this by 9^2 and yes it equals 9.
treydwg
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ok
treydwg
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what about 2v^2+7v+5 and I need tofactor by grouping?
treydwg
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I am at (2v^2+5v)(2v+5) and stuck
treydwg
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@godorovg can you assist?
godorovg
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yes
treydwg
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where do I go from here?
godorovg
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in this problem we need to use F,.O.I .L
treydwg
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ok yes
godorovg
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so now take the 2v^2 and times to 2v what is the answer
treydwg
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4v^2
godorovg
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close try again
godorovg
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4v is right your power is wrong
treydwg
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where are you getting the 2v^2*2v?
godorovg
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because you typed 4v^2 while ago
godorovg
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recall the problem here (2v^2+5v)(2v+5)
treydwg
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yes that what I have
treydwg
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2v(v+5)
treydwg
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the (2v+5) is where im stuck
treydwg
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what can I factor out of that?
godorovg
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now 4v is right because 2v times 2v =4v^2 but that is not what is happening here. You have a power being times by V what is the power of the V? that power of the V is ^1 and when times 2v^2 time 2v = 4v^3
godorovg
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so what happened here is we times the 2's to get 4 and v^2 + v^1 =V^3 see that
treydwg
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let me look at that hold on
treydwg
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ok I see it
treydwg
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now how do I fix the last part?
godorovg
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if you have a question plz ask me..
godorovg
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factoring will not be in use unti we finish F.O.I.L
treydwg
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I have (2v+5) how can I faactor this
godorovg
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no you can not factor that..
treydwg
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ok I see now so this is what I have after foil
4v^3+10v^2+35v
godorovg
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now we can factor
treydwg
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oooooooooh
treydwg
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by grouping?
godorovg
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no grouping there are no a like terms here
treydwg
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I know but i was going to use 35v and try to make another number to group
godorovg
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can not do that srry
treydwg
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ok so wehre from here
treydwg
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no GCF in common
godorovg
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okay let us look at this 4v^3+10v^2+35v what is the same with all the numbers?
treydwg
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v
godorovg
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yes V so how many V's can be factored?
treydwg
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1
treydwg
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v(2v^2+10v+35)
godorovg
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now look at the numbers what can each number be divided by?
treydwg
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v(4v^2+10v+35)
godorovg
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that is the answer it can not be factored any further
treydwg
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ahhhhhhh! Thats my problem i want to always factor further :/
treydwg
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Thank you
godorovg
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treydwg here is a help for you, if you have done all the factoring right than find a number that divides in to the first and see if it works for example 2 will go ino 4 =2 2 will also go into 10 five times but here is a question for you will 2 divide even into 35?
godorovg
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if the answer is no than you are finished..
treydwg
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no it wont and that was my problem
treydwg
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thanks
godorovg
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welcome anytime
godorovg
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before I leave any questions plz ask me
treydwg
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thanks
treydwg
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working on another
godorovg
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If you need help I am here
treydwg
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5x-3=14x+6
I got x=-1
godorovg
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no
godorovg
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5x-3=14x+6 get a like terms together so we x terms let us put the tgether like this 14x-5x=6-3 recall when a + or - crosses the equals sign it changes
treydwg
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x=3/9??
godorovg
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yes that is right
treydwg
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ok i did that one a little wrong thank you
treydwg
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now this one is throwing me off cuz the a^2
I have a^2=10-3a
I got
a^2=5/2
godorovg
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no now think about this one? come you do it!!
treydwg
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ok
godorovg
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first off you can not a^2 = 10 -3a and come out with a^2=5/2 no..
godorovg
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hint what happens to the problem when all nunbers are moved like this a^2+3a-10= what is this problem?
treydwg
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um
godorovg
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what did I say when a problem is set to zero is?
treydwg
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nothing is on one side
treydwg
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or they are all on one side rather
treydwg
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have to factor?
godorovg
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recall the problem a^2 = 10 -3a now look at the problem a^2+3a-10=
treydwg
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treydwg
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we have to find something in common
godorovg
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so what type of problem is this? not factoring
treydwg
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quadratic equation
godorovg
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yes
treydwg
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so i need to find out what two numbers product is 10 and sum is 3 right?
godorovg
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yes but I will let you try this way.
treydwg
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k
godorovg
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don't forget the a^2
treydwg
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a^2-2a+5a-10=0
treydwg
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(a+5)(a-2)
godorovg
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GREAT JOB!!!
treydwg
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awesome thank you again!
treydwg
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so the solution set is (a+5)(a-2)?
godorovg
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now I want you to check this
treydwg
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k how do I check?
godorovg
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simply take this (a+5)(a-2) use F.O.I.L and see if you get this back a^2+3a-10=
godorovg
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if you do than you are right..
treydwg
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alright
godorovg
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did you get it?
godorovg
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treydwg if you need help let me know..
treydwg
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now I got this one wrong? dont know why?
r^2+2r-48
I got
(r+8)(r-6)
treydwg
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sorry working on another one
godorovg
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which the - to 8 and try again
treydwg
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but 6-8 = -2 and not 2
godorovg
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try both -
treydwg
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that gives me a +48 and not -48
treydwg
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i am pretty sure im right but the computer counted it wrong??
godorovg
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treydwg is this a test?
treydwg
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yeah but I have three times to take
treydwg
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I can not figure this out and i know im right!
treydwg
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can you figure out why its wrong?
godorovg
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give me a minute
treydwg
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I have already taken the test. just reviewing results
godorovg
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okay that is better, I can get big trouble for helping on tests..
godorovg
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because you have taken it already no worries
treydwg
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yes all done and really confused because my answers I beleive are correct. There are many more like that. Have you figured out why im wrong?
godorovg
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working on it
treydwg
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thank you
godorovg
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okay try 24 times and see what happens and work it again
godorovg
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2
godorovg
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24 times 2?
treydwg
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k
godorovg
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friends are here
godorovg
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brb for me I have company over will back soon
treydwg
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thank you