How do you simplify  (x+3)(x-4)?

Jul 7, 2016

$\left(x + 3\right) \left(x - 4\right) = {x}^{2} - x - 12$

Explanation:

$\left(x + 3\right) \left(x - 4\right)$

= $x \left(x - 4\right) + 3 \left(x - 4\right)$

= ${x}^{2} - 4 x + 3 x - 12$

= ${x}^{2} - x - 12$