Solve for r
r=92
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\sqrt{r+8}+7=17
Swap sides so that all variable terms are on the left hand side.
\sqrt{r+8}=17-7
Subtract 7 from both sides.
\sqrt{r+8}=10
Subtract 7 from 17 to get 10.
r+8=100
Square both sides of the equation.
r+8-8=100-8
Subtract 8 from both sides of the equation.
r=100-8
Subtracting 8 from itself leaves 0.
r=92
Subtract 8 from 100.
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