What is the standard form for (x +3 ) (x-4)?

$a {x}^{2} + b x + c$
(Usually $a {x}^{2} + b x + c = 0$)
with constants $a , b , c$
$\left(x + 3\right) \left(x - 4\right)$
$= {x}^{2} - x - 12$