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Simplifying 2r2 + 9 = 0 Reorder the terms: 9 + 2r2 = 0 Solving 9 + 2r2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2r2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 2r2 = 0 + -9 2r2 = 0 + -9 Combine like terms: 0 + -9 = -9 2r2 = -9 Divide each side by '2'. r2 = -4.5 Simplifying r2 = -4.5 Reorder the terms: 4.5 + r2 = -4.5 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 4.5 + r2 = 0.0 The solution to this equation could not be determined.
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