## shannonaaa Factor: x2 - 9x + 12 one year ago one year ago

1. Study23

Well, the outer terms have to equal 12. The inner terms have to add to equal -9. What options do you have?

2. shannonaaa

A. (x + 1)(x - 12) B. (x + 2)(x + 6) C. (x - 2)(x - 6) D. prime

3. Study23

It's prime. None of the other options produce -9x when the inside and outside terms are added together.... Does that make sense to you?

4. shannonaaa

yes, thank you (:

5. UnkleRhaukus

$(x + 1)(x - 12)=x^2-11x-12\neq x^2 - 9x + 12$ $(x + 2)(x + 6)=x^2+8x+12\neq x^2 - 9x + 12$ $(x - 2)(x - 6)=x^2-8x+12\neq x^2 - 9x + 12$

6. Nancy_Lam

$x=\frac{-b^2\pm \sqrt{b^2-4ac}}{2a}$a=1, b= -9 , c=12