Question

Using identities, evaluate
${5.2}^2$

Answer 1

given, $(5.2{)}^2=(5+.02{)}^2$

$=5^2+(0.2{)}^2+2\times 5\times 0.2$

$=25+0.04+10\times 0.2$

$=25+2+0.04$

$=27.04$