Question

If
$- 2$
is a zero of the polynomial
$2 {x}^{3} + 4 {x}^{2} - x + k$
, then value of k is a) 2 b)-1 c) -2 d) 1

Answer 1

C is the correct answer k= -2.

Answer 2

Solution :--
x = -2
p(-2) = 2x³+4x²-x+K
=> 2(-2)³+4(-2)²-(-2)+k = 0
=> -16+16+2+k = 0
=> k = -2