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9x^{2}-\frac{42}{5}x+\frac{49}{25}
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(-3x+\frac{7}{5}\right)^{2}.
9x^{2}-\frac{42}{5}x+\frac{49}{25}
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(-3x+\frac{7}{5}\right)^{2}.