Question

Using the identity, evaluate the following.
${61}^2-{39}^2$

Answer 1

We have,

${61}^2-{39}^2$

We know that

$a^2-b^2=(a+b)(a-b)$

$=(61-39)(61+39)$

$=22\times 100$

$=2200$

Hence, this is the answer.