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Finding the Value of an Expression

Find the valu...

Question

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

A

15

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B

16

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C

54

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D

20

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Solution

The correct option is A
15

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

$\Rightarrow (3 - 2) (3^{2} + (3 \times 2))$

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

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

The value of the expression is 15.

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