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\left(-b\right)^{2}-2\left(-b\right)c+c^{2}
Utilitzeu el teorema del binomi \left(p-q\right)^{2}=p^{2}-2pq+q^{2} per desenvolupar \left(-b-c\right)^{2}.
b^{2}-2\left(-b\right)c+c^{2}
Calculeu -b elevat a 2 per obtenir b^{2}.
b^{2}+2bc+c^{2}
Multipliqueu -2 per -1 per obtenir 2.
\left(-b\right)^{2}-2\left(-b\right)c+c^{2}
Utilitzeu el teorema del binomi \left(p-q\right)^{2}=p^{2}-2pq+q^{2} per desenvolupar \left(-b-c\right)^{2}.
b^{2}-2\left(-b\right)c+c^{2}
Calculeu -b elevat a 2 per obtenir b^{2}.
b^{2}+2bc+c^{2}
Multipliqueu -2 per -1 per obtenir 2.