Question

using suitable isetities evaluate 101 * 102

Answer 1

(100+1)*(100+2)

ok bro using (a+b)(a-b) =asquare - b square

Answer 2

$(100 + 1)(100 + 2)$

$a = (100) {}^{2} \: and \: b = (1 + 2) {}^{2}$

$(100) {}^{2} (3) {}^{2}$

$10000 \times 9$

$90000$