Solve for r
r=\frac{2\sqrt{5}}{u}
u\neq 0
Solve for u
u=\frac{2\sqrt{5}}{r}
r\neq 0
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ru=2\sqrt{5}
Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.
ur=2\sqrt{5}
The equation is in standard form.
\frac{ur}{u}=\frac{2\sqrt{5}}{u}
Divide both sides by u.
r=\frac{2\sqrt{5}}{u}
Dividing by u undoes the multiplication by u.
ru=2\sqrt{5}
Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.
\frac{ru}{r}=\frac{2\sqrt{5}}{r}
Divide both sides by r.
u=\frac{2\sqrt{5}}{r}
Dividing by r undoes the multiplication by r.
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