Solve for w
w=\frac{n^{2}-9}{4}
Solve for n
n=\sqrt{4w+9}
n=-\sqrt{4w+9}\text{, }w\geq -\frac{9}{4}
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4w+9=n^{2}
Swap sides so that all variable terms are on the left hand side.
4w=n^{2}-9
Subtract 9 from both sides.
\frac{4w}{4}=\frac{n^{2}-9}{4}
Divide both sides by 4.
w=\frac{n^{2}-9}{4}
Dividing by 4 undoes the multiplication by 4.
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