MCQ
The factorization of $9x^2 - 3x - 20$ is:
- A$(3x - 4) (3x - 5)$
- ✓$(3x + 4) (3x - 5)$
- C$(3x + 4) (3x + 5)$
- D$(3x - 4) (3x + 5)$
✓
Answer
Correct option: B.
$(3x + 4) (3x - 5)$
$9x^2 - 3x - 20$
$= 9x^2 - 15x + 12x - 20$
$= 3x(3x - 5) + 4(3x - 5)$
$= (3x + 4) (3x - 5)$
$= 9x^2 - 15x + 12x - 20$
$= 3x(3x - 5) + 4(3x - 5)$
$= (3x + 4) (3x - 5)$
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