Solve for r
r=\frac{t^{2}}{2}
Solve for h
h\in \mathrm{R}
r=\frac{t^{2}}{2}
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2t^{2}-4r=\frac{\mathrm{d}}{\mathrm{d}h}(t)
Swap sides so that all variable terms are on the left hand side.
-4r=\frac{\mathrm{d}}{\mathrm{d}h}(t)-2t^{2}
Subtract 2t^{2} from both sides.
-4r=-2t^{2}
The equation is in standard form.
\frac{-4r}{-4}=-\frac{2t^{2}}{-4}
Divide both sides by -4.
r=-\frac{2t^{2}}{-4}
Dividing by -4 undoes the multiplication by -4.
r=\frac{t^{2}}{2}
Divide -2t^{2} by -4.
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