Question 14
PolynomialsIf x + 1 is a factor of x3 + 3x2 + kx + 4, find the value of k.
- A.6
- B.−6
- C.8
- D.−8
Show the answer and explanation
Answer: A (6)
Explanation
By the factor theorem, putting x = −1 gives zero: −1 + 3 − k + 4 = 0, so k = 6.
If x + 1 is a factor of x3 + 3x2 + kx + 4, find the value of k.
Answer: A (6)
By the factor theorem, putting x = −1 gives zero: −1 + 3 − k + 4 = 0, so k = 6.