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Simplifying 4r2 + 81 = 0 Reorder the terms: 81 + 4r2 = 0 Solving 81 + 4r2 = 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 + 4r2 = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 4r2 = 0 + -81 4r2 = 0 + -81 Combine like terms: 0 + -81 = -81 4r2 = -81 Divide each side by '4'. r2 = -20.25 Simplifying r2 = -20.25 Reorder the terms: 20.25 + r2 = -20.25 + 20.25 Combine like terms: -20.25 + 20.25 = 0.00 20.25 + r2 = 0.00 The solution to this equation could not be determined.
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