64s^2+144s=-81 can anyone help on this one. Solving for s

- anonymous

64s^2+144s=-81 can anyone help on this one. Solving for s

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- anonymous

64s^2+144s+81=0
(8s+9)^2=0
8s+9=0
8s=-9
s=-9/8

- anonymous

hmmm?

- anonymous

@marsss Thank you for the setup

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## More answers

- anonymous

I think this problem is quadtradic

- anonymous

i believe it is too

- anonymous

@godorovg you're a genius :)

- anonymous

@treydwg you're too :)

- anonymous

thanks lol

- anonymous

so the solution set would be

- anonymous

I working on it

- anonymous

in this problem the first clue is being = 0 usally says Quad needs to be used.

- anonymous

What is the easier way of working out qUADRATIC without using the quad formula?

- anonymous

64^2 is a peferct square so that always tells that this will invole in a square root to slove

- anonymous

you could use a^2+B^2=c^2 as well

- anonymous

So I got -1.125, -1.125. Can I write -1.125^2. Or is this considered incorrect?

- 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

Ok i just wrote it twice. lets see if it counts it correct?

- 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

ok

- anonymous

what about 2v^2+7v+5 and I need tofactor by grouping?

- anonymous

I am at (2v^2+5v)(2v+5) and stuck

- anonymous

@godorovg can you assist?

- anonymous

yes

- anonymous

where do I go from here?

- anonymous

in this problem we need to use F,.O.I .L

- anonymous

ok yes

- anonymous

so now take the 2v^2 and times to 2v what is the answer

- anonymous

4v^2

- anonymous

close try again

- anonymous

4v is right your power is wrong

- anonymous

where are you getting the 2v^2*2v?

- anonymous

because you typed 4v^2 while ago

- anonymous

recall the problem here (2v^2+5v)(2v+5)

- anonymous

yes that what I have

- anonymous

2v(v+5)

- anonymous

the (2v+5) is where im stuck

- anonymous

what can I factor out of that?

- 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

so what happened here is we times the 2's to get 4 and v^2 + v^1 =V^3 see that

- anonymous

let me look at that hold on

- anonymous

ok I see it

- anonymous

now how do I fix the last part?

- anonymous

if you have a question plz ask me..

- anonymous

factoring will not be in use unti we finish F.O.I.L

- anonymous

I have (2v+5) how can I faactor this

- anonymous

no you can not factor that..

- anonymous

ok I see now so this is what I have after foil
4v^3+10v^2+35v

- anonymous

now we can factor

- anonymous

oooooooooh

- anonymous

by grouping?

- anonymous

no grouping there are no a like terms here

- anonymous

I know but i was going to use 35v and try to make another number to group

- anonymous

can not do that srry

- anonymous

ok so wehre from here

- anonymous

no GCF in common

- anonymous

okay let us look at this 4v^3+10v^2+35v what is the same with all the numbers?

- anonymous

v

- anonymous

yes V so how many V's can be factored?

- anonymous

1

- anonymous

v(2v^2+10v+35)

- anonymous

now look at the numbers what can each number be divided by?

- anonymous

v(4v^2+10v+35)

- anonymous

that is the answer it can not be factored any further

- anonymous

ahhhhhhh! Thats my problem i want to always factor further :/

- anonymous

Thank you

- 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

if the answer is no than you are finished..

- anonymous

no it wont and that was my problem

- anonymous

thanks

- anonymous

welcome anytime

- anonymous

before I leave any questions plz ask me

- anonymous

thanks

- anonymous

working on another

- anonymous

If you need help I am here

- anonymous

5x-3=14x+6
I got x=-1

- anonymous

no

- 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

x=3/9??

- anonymous

yes that is right

- anonymous

ok i did that one a little wrong thank you

- 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

no now think about this one? come you do it!!

- anonymous

ok

- anonymous

first off you can not a^2 = 10 -3a and come out with a^2=5/2 no..

- anonymous

hint what happens to the problem when all nunbers are moved like this a^2+3a-10= what is this problem?

- anonymous

um

- anonymous

what did I say when a problem is set to zero is?

- anonymous

nothing is on one side

- anonymous

or they are all on one side rather

- anonymous

have to factor?

- anonymous

recall the problem a^2 = 10 -3a now look at the problem a^2+3a-10=

- anonymous

0

- anonymous

we have to find something in common

- anonymous

so what type of problem is this? not factoring

- anonymous

quadratic equation

- anonymous

yes

- anonymous

so i need to find out what two numbers product is 10 and sum is 3 right?

- anonymous

yes but I will let you try this way.

- anonymous

k

- anonymous

don't forget the a^2

- anonymous

a^2-2a+5a-10=0

- anonymous

(a+5)(a-2)

- anonymous

GREAT JOB!!!

- anonymous

awesome thank you again!

- anonymous

so the solution set is (a+5)(a-2)?

- anonymous

now I want you to check this

- anonymous

k how do I check?

- 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

if you do than you are right..

- anonymous

alright

- anonymous

did you get it?

- anonymous

treydwg if you need help let me know..

- anonymous

now I got this one wrong? dont know why?
r^2+2r-48
I got
(r+8)(r-6)

- anonymous

sorry working on another one

- anonymous

which the - to 8 and try again

- anonymous

but 6-8 = -2 and not 2

- anonymous

try both -

- anonymous

that gives me a +48 and not -48

- anonymous

i am pretty sure im right but the computer counted it wrong??

- anonymous

treydwg is this a test?

- anonymous

yeah but I have three times to take

- anonymous

I can not figure this out and i know im right!

- anonymous

can you figure out why its wrong?

- anonymous

give me a minute

- anonymous

I have already taken the test. just reviewing results

- anonymous

okay that is better, I can get big trouble for helping on tests..

- anonymous

because you have taken it already no worries

- 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

working on it

- anonymous

thank you

- anonymous

okay try 24 times and see what happens and work it again

- anonymous

2

- anonymous

24 times 2?

- anonymous

k

- anonymous

friends are here

- anonymous

brb for me I have company over will back soon

- anonymous

thank you

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