Question

If x + 1 is a factor of 3x3 + kx2 + 7x + 4 , then the value of kis:
(a) -1
(b) 0
(c) 6
(d) 10

Answer 1

Answer:

k = 6

Step-by-step explanation:

If x + 1 is a factor then,,

x + 1 = 0

x = -1

==: 3x³ + kx² + 7x + 4 = 0

==: 3(-1)³ + k(-1)² + 7(-1) + 4 = 0

==: -3 + k - 7 + 4 = 0

==: k - 6 = 0

==: k = 6

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