Solve for k
k=m+\left(\frac{n}{m}\right)^{2}
\left(m>0\text{ and }n>0\right)\text{ or }\left(m<0\text{ and }n<0\right)
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\frac{\frac{1}{n}\sqrt{k-m}n}{1}=\frac{1}{m\times \frac{1}{n}}
Divide both sides by n^{-1}.
\sqrt{k-m}=\frac{1}{m\times \frac{1}{n}}
Dividing by n^{-1} undoes the multiplication by n^{-1}.
\sqrt{k-m}=\frac{n}{m}
Divide \frac{1}{m} by n^{-1}.
k-m=\frac{n^{2}}{m^{2}}
Square both sides of the equation.
k-m-\left(-m\right)=\frac{n^{2}}{m^{2}}-\left(-m\right)
Subtract -m from both sides of the equation.
k=\frac{n^{2}}{m^{2}}-\left(-m\right)
Subtracting -m from itself leaves 0.
k=m+\frac{n^{2}}{m^{2}}
Subtract -m from \frac{n^{2}}{m^{2}}.
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