Question

If (x+1) is a factor of the polynomial $(2x^2+kx)$ then k=?
(a) 4
(b) -3
(c) 2
(d) -2

Answer 1

ANSWER:
(c) 2
(x+1) is a factor of $2x^2+kx$.So, -1 is a zero of $2x^2+kx$.Thus, we have:

$2\times -1^2+k\times -1=0$

⇒2-k=0

⇒k=2