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4+4x_{2}+x_{2}^{2}
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(2+x_{2}\right)^{2}.
4+4x_{2}+x_{2}^{2}
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(2+x_{2}\right)^{2}.