# How do you simplify (3x^2 + 2x + 1) + (x-8)?

$f \left(x\right) = 3 {x}^{2} + 2 x + 1 + \left(x - 8\right)$
$f \left(x\right) = 3 {x}^{2} + 3 x - 7$
$D = {b}^{2} - 4 a c = 9 + 84 = 93$