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Resolver B
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Resolver x (complex solution)
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Resolver x
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B=16x^{2}+24x+9-16
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(4x+3\right)^{2}.
B=16x^{2}+24x-7
Resta 16 de 9 para obter -7.