Question

If p(x)=5-4x+2x2 then find p(-2)​

Answer 1

$= 5 - 4x + 2 {x}^{2}$

Put x=(-2)

$= 5 - 4( - 2) + 2 {( - 2)}^{2}$

$= 5 + 8 + 2 \times 4$

$= 13 + 8$

$= 21$