MCQ
If (x + 1) is a factor of the polynomial (2x2 + kx) then k = ?
- A4
- B-3
- C2
- D-2
✓
Answer
- 2
Solution:
Let p(x) = 2x2 + kx
Since (x + 1) is a factor of p(x),
= P(-1) = 0
⇒ 2(-1)2 + k(-1) = 0
⇒ 2 - k = 0
⇒ k = 2
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