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25a^{2}-40ab+16b^{2}
Usar teorema binomial \left(p+q\right)^{2}=p^{2}+2pq+q^{2} para expandir \left(-5a+4b\right)^{2}.
25a^{2}-40ab+16b^{2}
Usar teorema binomial \left(p+q\right)^{2}=p^{2}+2pq+q^{2} para expandir \left(-5a+4b\right)^{2}.