Solve for b
b=a^{2}-20
Solve for a (complex solution)
a=-\sqrt{b+20}
a=\sqrt{b+20}
Solve for a
a=\sqrt{b+20}
a=-\sqrt{b+20}\text{, }b\geq -20
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-b=20-a^{2}
Subtract a^{2} from both sides.
\frac{-b}{-1}=\frac{20-a^{2}}{-1}
Divide both sides by -1.
b=\frac{20-a^{2}}{-1}
Dividing by -1 undoes the multiplication by -1.
b=a^{2}-20
Divide 20-a^{2} by -1.
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