Question

Find the value of expression $(a-b)(a^2+ab)$ when a = 3 and b = 2?

• A. 15
• B. 16
• C. 54
• D. 20

Answer 1

The correct option is A

15

Substituting values of a = 3 and b = 2 in the expression:

$\Rightarrow (3-2)(3^2+(3\times 2\left)\right)$

$\Rightarrow (3-2)(9+6)$

$\Rightarrow \left(1\right)\left(15\right)=15$

The value of the expression is 15.