# V = 3b + 2b^2 What is the value of V when b = –4?

$V = 3 b + 2 {b}^{2}$
So when $b = - 4$ we have;
$V = 3 \left(- 4\right) + 2 {\left(- 4\right)}^{2}$
$\therefore V = - 12 + 2 \left(- 4\right) \left(- 4\right)$
$\therefore V = - 12 + 2 \left(16\right)$
$\therefore V = - 12 + 32$
$\therefore V = 20$