Question

Evaluate: $176\times 176-124\times 124$

• A. 15400
• B. 15600
• C. 16500
• D. 12280

Answer 1

Answer: (B)

Given:

$176\times 176-124\times 124$

$={176}^2-{124}^2$

$=\left(\right(176+124\left)\right(176-124)$ [$\because a^2-b^2=(a+b)(a-b)$]

$=300\times 52$

$=15600$

$\therefore 176\times 176-124\times 124=15600$

Hence, Option $B$ is correct.