Solve for u
u=2\sqrt{10}-10\approx -3.67544468
u=-2\sqrt{10}-10\approx -16.32455532
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\left(u+10\right)^{2}-40+40=40
Add 40 to both sides of the equation.
\left(u+10\right)^{2}=40
Subtracting 40 from itself leaves 0.
u+10=2\sqrt{10} u+10=-2\sqrt{10}
Take the square root of both sides of the equation.
u+10-10=2\sqrt{10}-10 u+10-10=-2\sqrt{10}-10
Subtract 10 from both sides of the equation.
u=2\sqrt{10}-10 u=-2\sqrt{10}-10
Subtracting 10 from itself leaves 0.
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