Question

Produtos notaveis
23²=(20+3)²

Answer 1

${23}^{2} = \: {(20 \: + \: 3)}^{2}$

${20}^{2} + 2.3.20 \: + \: {3}^{2}$

$400 \: + \: 120 \: + 9$

$529$

${(23)}^{2} \: = \: 529$