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\left(5x+20\right)^{2}
Multiplica 5x+20 e 5x+20 para obter \left(5x+20\right)^{2}.
25x^{2}+200x+400
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(5x+20\right)^{2}.
\left(5x+20\right)^{2}
Multiplica 5x+20 e 5x+20 para obter \left(5x+20\right)^{2}.
25x^{2}+200x+400
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(5x+20\right)^{2}.