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Simplifying 4r2 + 9 = r Reorder the terms: 9 + 4r2 = r Solving 9 + 4r2 = r Solving for variable 'r'. Reorder the terms: 9 + -1r + 4r2 = r + -1r Combine like terms: r + -1r = 0 9 + -1r + 4r2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 2.25 + -0.25r + r2 = 0 Move the constant term to the right: Add '-2.25' to each side of the equation. 2.25 + -0.25r + -2.25 + r2 = 0 + -2.25 Reorder the terms: 2.25 + -2.25 + -0.25r + r2 = 0 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + -0.25r + r2 = 0 + -2.25 -0.25r + r2 = 0 + -2.25 Combine like terms: 0 + -2.25 = -2.25 -0.25r + r2 = -2.25 The r term is -0.25r. Take half its coefficient (-0.125). Square it (0.015625) and add it to both sides. Add '0.015625' to each side of the equation. -0.25r + 0.015625 + r2 = -2.25 + 0.015625 Reorder the terms: 0.015625 + -0.25r + r2 = -2.25 + 0.015625 Combine like terms: -2.25 + 0.015625 = -2.234375 0.015625 + -0.25r + r2 = -2.234375 Factor a perfect square on the left side: (r + -0.125)(r + -0.125) = -2.234375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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