MCQ
Mark $(\checkmark)$ against the correct answer: $12x^2 + 60x + 75 =\ ?$
- A$(2x + 5)(6x + 5)$
- B$(3x + 5)^2$
- ✓$3(2x + 5)^2$
- DNone of these
✓
Answer
Correct option: C.
$3(2x + 5)^2$
C. $3(2x + 5)^2$
Solution:
$12x^2+ 60x + 75$
$= 3(4x^2+ 20x + 25)$
$= 3((2x)^2 + 2 \times 2x \times 5 + 5^2)$
$= 3(2x + 5)^2$
Solution:
$12x^2+ 60x + 75$
$= 3(4x^2+ 20x + 25)$
$= 3((2x)^2 + 2 \times 2x \times 5 + 5^2)$
$= 3(2x + 5)^2$
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