Question

${( - \frac{1}{2}a) }^{2} =$
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Answer 1

$\left(-\frac{1}{2}a\right)^2\\\\\left(-\frac{1}{2}a\right)^2=\left(\frac{1}{2}a\right)^2\\\\=\left(\frac{1}{2}a\right)^2\\\\\left(\frac{1}{2}a\right)^2=\left(\frac{1}{2}\right)^2a^2\\\\=\left(\frac{1}{2}\right)^2a^2\\\\=\frac{1}{4}a^2\\\\=\frac{a^2}{4}$