Question

Help and explain plz

Answer 1

$a {x}^{2} + bx + c \\ \frac{ - b}{2a} = - 2 > > > b = 4a \\ a {x}^{2} + 4ax + c$
put points in and find a and b easily
$c = 0 \\ 9a - 12a = 3 > > a = - 1$
$- {x}^{2} - 4x = f(x)$