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Simplifying r2 + r + 28 = 0 Reorder the terms: 28 + r + r2 = 0 Solving 28 + r + r2 = 0 Solving for variable 'r'. Begin completing the square. Move the constant term to the right: Add '-28' to each side of the equation. 28 + r + -28 + r2 = 0 + -28 Reorder the terms: 28 + -28 + r + r2 = 0 + -28 Combine like terms: 28 + -28 = 0 0 + r + r2 = 0 + -28 r + r2 = 0 + -28 Combine like terms: 0 + -28 = -28 r + r2 = -28 The r term is r. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. r + 0.25 + r2 = -28 + 0.25 Reorder the terms: 0.25 + r + r2 = -28 + 0.25 Combine like terms: -28 + 0.25 = -27.75 0.25 + r + r2 = -27.75 Factor a perfect square on the left side: (r + 0.5)(r + 0.5) = -27.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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