anonymous
  • anonymous
Solve by factoring. 4x2 + 23x + 15 = 0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
ooh i like these
freckles
  • 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
  • anonymous
(x+5)*(4*x+3)

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anonymous
  • anonymous
Good! Can you help me?
freckles
  • freckles
find two factors*
freckles
  • freckles
So what is a here? And what is b here? And what is c here?
anonymous
  • anonymous
\[4x ^{2}+23x+15=0\]
anonymous
  • anonymous
(x+5)*(4*x+3) x= -5 and -3/4 right
freckles
  • freckles
@timo86m I don't think it helps to give the answer. Can you explain how you got those factors?
anonymous
  • 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
  • freckles
@Makayla43 if you want to learn this, I'm trying to teach you.
freckles
  • freckles
What is a,b, and c in your equation?
anonymous
  • anonymous
@KNicksfan4life :D (:
anonymous
  • anonymous
(4x-3)(x-5)
anonymous
  • anonymous
@freckles what do you mean a,b,and c?
anonymous
  • anonymous
is that rite
anonymous
  • anonymous
it not right
freckles
  • freckles
\[ax^2+bx+c=0\] \[4x^2+23x+15=0\]
anonymous
  • anonymous
(x+5)*(4*x+3) if you not sure you can always expand this
anonymous
  • anonymous
Solve by factoring. -3x2 - x + 2 = 0
anonymous
  • anonymous
-(x+1)*(3*x-2)
anonymous
  • anonymous
\[-3x ^{2}-x+2=0\]
anonymous
  • anonymous
-3x2 - x + 2 = 0 you actually mean -3x^2 - x + 2 = 0
anonymous
  • 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
  • anonymous
I think it d
myininaya
  • 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
  • anonymous
Omg.
anonymous
  • anonymous
i teached, I said expand my factor if she doubts it lol.
myininaya
  • myininaya
But @timo86m how do you get the factors? Please explain that part so she will know how to do it.
anonymous
  • anonymous
Goodbye. He sent me a message a explained.
anonymous
  • anonymous
4x2 + 23x + 15 = 0 number that up to 15 and product is 23
anonymous
  • anonymous
To factor is mostly guess work that is where I draw the line :)
anonymous
  • 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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