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Simplifying 81 + 3r2 = r2 Solving 81 + 3r2 = r2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r2' to each side of the equation. 81 + 3r2 + -1r2 = r2 + -1r2 Combine like terms: 3r2 + -1r2 = 2r2 81 + 2r2 = r2 + -1r2 Combine like terms: r2 + -1r2 = 0 81 + 2r2 = 0 Add '-81' to each side of the equation. 81 + -81 + 2r2 = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 2r2 = 0 + -81 2r2 = 0 + -81 Combine like terms: 0 + -81 = -81 2r2 = -81 Divide each side by '2'. r2 = -40.5 Simplifying r2 = -40.5 Reorder the terms: 40.5 + r2 = -40.5 + 40.5 Combine like terms: -40.5 + 40.5 = 0.0 40.5 + r2 = 0.0 The solution to this equation could not be determined.
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