Question

Factor: x2 - 9x + 12

Answer 1

One technique that always works is to use the quadratic formula.

A Quadratic Equation\[ax^2+bx+c=0\]
The Quadratic Formula\[x_{1,2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\]
Factored for of the Quadratic Equation\[(x-x_1)(x-x_2)=0\]

start by identifying the coefficients a,b,c

Compare
\[x^2 - 9x + 12=0\]
With
\[ax^2+bx+c=0\]

\(a=\)?
\(b=\)?
\(c=\)?