Question

If (x + 2) is factor of the polynomial 3x

2 + Kx, then the value of K is :

(a) 4

(b) 6

(c) 8

(d) 12

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Answer 1

the value of k is 6..............

Answer 2

Answer:

If x+2 is a factor then x=-2

3x²+kx=3(-2)²-2k=0

12-2k=0

12=2k

k=6