anonymous
  • anonymous
how do i factor 2x^2-5x+3?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
are you familiar with ,factoring by grouping?
anonymous
  • anonymous
yes but there are only 3 numbers.....
anonymous
  • anonymous
well, look at the middle number, can you seperate that into 2 numbers that would allow you to factor by grouping?

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anonymous
  • anonymous
examples -5x=-2x+-3x -5x=-4x+-1x -5x=-6x+ 1x -5x= 6x + -1x
anonymous
  • anonymous
(2x )(x ) and it has to be 3 and 1 if it's an easy factorization
anonymous
  • anonymous
thanks also how do you factor 2x^2+7x-15
anonymous
  • anonymous
You can use this formula: \[x _{1,2} = \frac{ -b \pm \sqrt{b ^{2} - 4ac} }{ 2a }\] where a = 2, b = -5, c =3
anonymous
  • anonymous
The value of a,b and c, you can get from the equation \[ax ^{2}+bx+c\] You can solve the various forms of equations with ease.
anonymous
  • anonymous
This is just another of same (2x )(x ) and your 15 breaks out into 5 and 3
anonymous
  • anonymous
ya but they dont add to 7 right?......
anonymous
  • anonymous
depends on the sign and where you put each one....

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