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Simplifying r2 + 9 + 81 = 81 Reorder the terms: 9 + 81 + r2 = 81 Combine like terms: 9 + 81 = 90 90 + r2 = 81 Solving 90 + r2 = 81 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + r2 = 81 + -90 Combine like terms: 90 + -90 = 0 0 + r2 = 81 + -90 r2 = 81 + -90 Combine like terms: 81 + -90 = -9 r2 = -9 Simplifying r2 = -9 Reorder the terms: 9 + r2 = -9 + 9 Combine like terms: -9 + 9 = 0 9 + r2 = 0 The solution to this equation could not be determined.
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