Question

Factorize: $3a^2-9ab$

• A. $3a(3a-3b)$
• B. $3a(a-3b)$
• C. $3b(3a-3)$
• D. $3a(a-9b)$

Answer 1

The correct option is B $3a(a-3b)$

$\Rightarrow 3a^2-9ab$

$\text{Taking out '3a' as common term, we get}$

$\Rightarrow 3a(\frac{3a^2}{3a}-\frac{9ab}{3a})$

$\Rightarrow 3a(a-3b)$