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Resolver B
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Resolver x (complex solution)
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B=\left(-x\right)^{2}-10\left(-x\right)+25-25
Usar teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(-x-5\right)^{2}.
B=x^{2}-10\left(-x\right)+25-25
Calcula -x á potencia de 2 e obtén x^{2}.
B=x^{2}+10x+25-25
Multiplica -10 e -1 para obter 10.
B=x^{2}+10x
Resta 25 de 25 para obter 0.