anonymous
  • anonymous
64s^2+144s=-81 can anyone help on this one. Solving for s
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
64s^2+144s+81=0 (8s+9)^2=0 8s+9=0 8s=-9 s=-9/8
anonymous
  • anonymous
hmmm?
anonymous
  • anonymous
@marsss Thank you for the setup

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

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