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Simplifying
-1r2s2 + 81 = 0
Reorder the terms:
81 + -1r2s2 = 0
Solving
81 + -1r2s2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-81' to each side of the equation.
81 + -81 + -1r2s2 = 0 + -81
Combine like terms: 81 + -81 = 0
0 + -1r2s2 = 0 + -81
-1r2s2 = 0 + -81
Combine like terms: 0 + -81 = -81
-1r2s2 = -81
Divide each side by '-1s2'.
r2 = 81s-2
Simplifying
r2 = 81s-2
Take the square root of each side:
r = {-9s-1, 9s-1}
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