MCQ
(x2 - 4x - 21) = ?
- A(x + 7) (x - 3)
- B(x - 7) (x + 3)
- C(x - 7) (x - 3)
- DNone of these.
✓
Answer
- (x - 7) (x + 3)
Solution:
(x2 - 4x - 21) = x2 - 7x + 3x - 21
= x(x - 7) + 3(x - 7)
= (x - 7) (x + 3)
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