2018 · Q16
The remainder when 3x³ + kx² + 5x - 6 is divided by (x + 1) is -7. What is the value of k?
Elementary MathematicsAlgebra
- A-14
- B14
- C-7
- D7
Explanation
The remainder on dividing by (x + 1) is f(−1) = −3 + k − 5 − 6 = k − 14. Setting this equal to −7 gives k = 7, option (D).