Question

Expand using binomial theorem $(a+b{)}^2$.

Answer 1

Apply binomial theorem to the term ${\left(a+b\right)}^2$.

${\left(a+b\right)}^2={}^2{C}_0{a}^2{b}^0+{}^2{C}_1{a}^1{b}^1+{}^2{C}_2{a}^0{b}^2$

${\left(a+b\right)}^2=a^2+2ab+b^2$