dddan 3 years ago how do i factor 2x^2-5x+3?

1. completeidiot

are you familiar with ,factoring by grouping?

2. dddan

yes but there are only 3 numbers.....

3. completeidiot

well, look at the middle number, can you seperate that into 2 numbers that would allow you to factor by grouping?

4. completeidiot

examples -5x=-2x+-3x -5x=-4x+-1x -5x=-6x+ 1x -5x= 6x + -1x

5. estudier

(2x )(x ) and it has to be 3 and 1 if it's an easy factorization

6. dddan

thanks also how do you factor 2x^2+7x-15

7. Husnul_Aini

You can use this formula: $x _{1,2} = \frac{ -b \pm \sqrt{b ^{2} - 4ac} }{ 2a }$ where a = 2, b = -5, c =3

8. Husnul_Aini

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.

9. estudier

This is just another of same (2x )(x ) and your 15 breaks out into 5 and 3

10. dddan

ya but they dont add to 7 right?......

11. estudier

depends on the sign and where you put each one....