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\frac{9}{4}a^{2}-6ab+4b^{2}-\left(-\frac{1}{2}a+3b\right)^{2}-2\left(-a\right)^{2}
Utilize o teorema binomial \left(p-q\right)^{2}=p^{2}-2pq+q^{2} para expandir \left(\frac{3}{2}a-2b\right)^{2}.
\frac{9}{4}a^{2}-6ab+4b^{2}-\left(\frac{1}{4}a^{2}-3ab+9b^{2}\right)-2\left(-a\right)^{2}
Utilize o teorema binomial \left(p+q\right)^{2}=p^{2}+2pq+q^{2} para expandir \left(-\frac{1}{2}a+3b\right)^{2}.
\frac{9}{4}a^{2}-6ab+4b^{2}-\frac{1}{4}a^{2}+3ab-9b^{2}-2\left(-a\right)^{2}
Para calcular o oposto de \frac{1}{4}a^{2}-3ab+9b^{2}, calcule o oposto de cada termo.
2a^{2}-6ab+4b^{2}+3ab-9b^{2}-2\left(-a\right)^{2}
Combine \frac{9}{4}a^{2} e -\frac{1}{4}a^{2} para obter 2a^{2}.
2a^{2}-3ab+4b^{2}-9b^{2}-2\left(-a\right)^{2}
Combine -6ab e 3ab para obter -3ab.
2a^{2}-3ab-5b^{2}-2\left(-a\right)^{2}
Combine 4b^{2} e -9b^{2} para obter -5b^{2}.
2a^{2}-3ab-5b^{2}-2a^{2}
Calcule -a elevado a 2 e obtenha a^{2}.
-3ab-5b^{2}
Combine 2a^{2} e -2a^{2} para obter 0.
\frac{9}{4}a^{2}-6ab+4b^{2}-\left(-\frac{1}{2}a+3b\right)^{2}-2\left(-a\right)^{2}
Utilize o teorema binomial \left(p-q\right)^{2}=p^{2}-2pq+q^{2} para expandir \left(\frac{3}{2}a-2b\right)^{2}.
\frac{9}{4}a^{2}-6ab+4b^{2}-\left(\frac{1}{4}a^{2}-3ab+9b^{2}\right)-2\left(-a\right)^{2}
Utilize o teorema binomial \left(p+q\right)^{2}=p^{2}+2pq+q^{2} para expandir \left(-\frac{1}{2}a+3b\right)^{2}.
\frac{9}{4}a^{2}-6ab+4b^{2}-\frac{1}{4}a^{2}+3ab-9b^{2}-2\left(-a\right)^{2}
Para calcular o oposto de \frac{1}{4}a^{2}-3ab+9b^{2}, calcule o oposto de cada termo.
2a^{2}-6ab+4b^{2}+3ab-9b^{2}-2\left(-a\right)^{2}
Combine \frac{9}{4}a^{2} e -\frac{1}{4}a^{2} para obter 2a^{2}.
2a^{2}-3ab+4b^{2}-9b^{2}-2\left(-a\right)^{2}
Combine -6ab e 3ab para obter -3ab.
2a^{2}-3ab-5b^{2}-2\left(-a\right)^{2}
Combine 4b^{2} e -9b^{2} para obter -5b^{2}.
2a^{2}-3ab-5b^{2}-2a^{2}
Calcule -a elevado a 2 e obtenha a^{2}.
-3ab-5b^{2}
Combine 2a^{2} e -2a^{2} para obter 0.