Question

( a + b )² = a² + 2ab + b²

Answer 1

(a + b)² = (a + b) (a + b) -> Aplica a propriedade distributiva!

$(a + b) \times (a + b)$

${a}^{2} + ab + ab + {b}^{2}$

${a}^{2} + 2ab + {b}^{2}$