Solve for x
x=\frac{\lambda ^{2}-F}{2}
Solve for F
F=\lambda ^{2}-2x
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-2x=F-\lambda ^{2}
Subtract \lambda ^{2} from both sides.
\frac{-2x}{-2}=\frac{F-\lambda ^{2}}{-2}
Divide both sides by -2.
x=\frac{F-\lambda ^{2}}{-2}
Dividing by -2 undoes the multiplication by -2.
x=\frac{\lambda ^{2}-F}{2}
Divide F-\lambda ^{2} by -2.
F=\lambda ^{2}-2x
Swap sides so that all variable terms are on the left hand side.
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