Question

Evaluate -7x3 +3x2 + 11x - 9 (for x = -2)​

Answer 1

-7*3 + 3*2 + 11*(-2)(i.e x) -9
= -21+6-22-9
= -46

Answer 2

$= \: - 7 {x}^{3} + 3 {x}^{2} + 11x - 9$

$= \: - 7 {( - 2)}^{3} + 3 { (- 2)}^{2} + 11( - 2) - 9$

$= \: - 7( - 8) + 3(4) - 22 - 9$

$= \: 56 + 12 - 22 - 9$

$= \: 68 - 31$

$= 37$