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Resolver A
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Resolver x (complex solution)
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Resolver x
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A=9x^{2}-12x+4-2
Usar teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(3x-2\right)^{2}.
A=9x^{2}-12x+2
Resta 2 de 4 para obter 2.