Question

Solve (1005)2 by using suitable identity ​

Answer 1

${(1005)}^{2}$

$=(1000 + 5) ^{2}$

$in \: the \: form \: of \: \\ (a + b) {}^{2} = a {}^{2} + b {}^{2} + 2ab$

$so \\ = {(1000)}^{2} + (5) {}^{2} + 2(1000)(5)$

$= 1000000 + 25 + 10000$

$= 1010025$

Hope this helps you