Question

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Answer 1

Respuesta:

a² + c²

Explicación paso a paso:

$( {a + b})^{2} + ( {b + c})^{2} - 2ab - 2bc - 2 {b}^{2} \\ \\ = {a}^{2} + 2ab + {b}^{2} + {b}^{2} + 2bc + {c}^{2} - 2ab - 2bc - 2 {b}^{2} \\ \\ = {a}^{2} + 2ab + 2 {b}^{2} + 2bc + {c}^{2} - 2ab - 2bc - 2 {b}^{2} \\ \\ = {a}^{2} + {c}^{2}$