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9q^{2}+6q+1
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(3q+1\right)^{2}.
9q^{2}+6q+1
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(3q+1\right)^{2}.