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