Solve for a
a=x^{2}-4
Solve for x (complex solution)
x=-\sqrt{a+4}
x=\sqrt{a+4}
Solve for x
x=\sqrt{a+4}
x=-\sqrt{a+4}\text{, }a\geq -4
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-a=4-x^{2}
Subtract x^{2} from both sides.
\frac{-a}{-1}=\frac{4-x^{2}}{-1}
Divide both sides by -1.
a=\frac{4-x^{2}}{-1}
Dividing by -1 undoes the multiplication by -1.
a=x^{2}-4
Divide -x^{2}+4 by -1.
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