Solve by factoring.
4x2 + 23x + 15 = 0

- anonymous

Solve by factoring.
4x2 + 23x + 15 = 0

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- anonymous

ooh i like these

- freckles

\[ax^2+bx+c=0\]
So what you want to do is find factors of a*c that have product a*c and sum b.

- anonymous

(x+5)*(4*x+3)

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## More answers

- anonymous

Good! Can you help me?

- freckles

find two factors*

- freckles

So what is a here?
And what is b here?
And what is c here?

- anonymous

\[4x ^{2}+23x+15=0\]

- anonymous

(x+5)*(4*x+3)
x= -5 and -3/4 right

- freckles

@timo86m I don't think it helps to give the answer. Can you explain how you got those factors?

- anonymous

A:x = 0.8 or x = -0.75 C:x = 0.75 or x = 5
B:x = -3 or x = -1.25 D:x = -0.75 or x = -5

- freckles

@Makayla43 if you want to learn this, I'm trying to teach you.

- freckles

What is a,b, and c in your equation?

- anonymous

@KNicksfan4life :D (:

- anonymous

(4x-3)(x-5)

- anonymous

@freckles what do you mean a,b,and c?

- anonymous

is that rite

- anonymous

it not right

- freckles

\[ax^2+bx+c=0\]
\[4x^2+23x+15=0\]

- anonymous

(x+5)*(4*x+3) if you not sure you can always expand this

- anonymous

Solve by factoring.
-3x2 - x + 2 = 0

- anonymous

-(x+1)*(3*x-2)

- anonymous

\[-3x ^{2}-x+2=0\]

- anonymous

-3x2 - x + 2 = 0
you actually mean
-3x^2 - x + 2 = 0

- anonymous

A:x = 0.5 or x = 0.33333 C:x = 1 or x = -0.66667
B:x = 0.33333 or x = -2 D:x = -1 or x = 0.66667

- anonymous

I think it d

- myininaya

You guys how is this teaching and how is this learning?
Please try to teach @Makayla43 and not just give the answer.
And @Makayla43 you shouldn't be just looking for answers.
I think freckles here was trying to teach you how to do this.

- anonymous

Omg.

- anonymous

i teached, I said expand my factor if she doubts it lol.

- myininaya

But @timo86m how do you get the factors? Please explain that part so she will know how to do it.

- anonymous

Goodbye. He sent me a message a explained.

- anonymous

4x2 + 23x + 15 = 0
number that up to 15 and product is 23

- anonymous

To factor is mostly guess work that is where I draw the line :)

- anonymous

number that up to c and product is b coefficient.
It is more important to show why it works then how to do something that is mostly guess work.

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