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\left(-\frac{1}{2}x\right)^{2}-\left(3y\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\left(-\frac{1}{2}\right)^{2}x^{2}-\left(3y\right)^{2}
Expand \left(-\frac{1}{2}x\right)^{2}.
\frac{1}{4}x^{2}-\left(3y\right)^{2}
Calculate -\frac{1}{2} to the power of 2 and get \frac{1}{4}.
\frac{1}{4}x^{2}-3^{2}y^{2}
Expand \left(3y\right)^{2}.
\frac{1}{4}x^{2}-9y^{2}
Calculate 3 to the power of 2 and get 9.
\left(-\frac{1}{2}x\right)^{2}-\left(3y\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\left(-\frac{1}{2}\right)^{2}x^{2}-\left(3y\right)^{2}
Expand \left(-\frac{1}{2}x\right)^{2}.
\frac{1}{4}x^{2}-\left(3y\right)^{2}
Calculate -\frac{1}{2} to the power of 2 and get \frac{1}{4}.
\frac{1}{4}x^{2}-3^{2}y^{2}
Expand \left(3y\right)^{2}.
\frac{1}{4}x^{2}-9y^{2}
Calculate 3 to the power of 2 and get 9.