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Simplifying 9r2 + -16r + 9 = 0 Reorder the terms: 9 + -16r + 9r2 = 0 Solving 9 + -16r + 9r2 = 0 Solving for variable 'r'. Begin completing the square. Divide all terms by 9 the coefficient of the squared term: Divide each side by '9'. 1 + -1.777777778r + r2 = 0 Move the constant term to the right: Add '-1' to each side of the equation. 1 + -1.777777778r + -1 + r2 = 0 + -1 Reorder the terms: 1 + -1 + -1.777777778r + r2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1.777777778r + r2 = 0 + -1 -1.777777778r + r2 = 0 + -1 Combine like terms: 0 + -1 = -1 -1.777777778r + r2 = -1 The r term is -1.777777778r. Take half its coefficient (-0.888888889). Square it (0.7901234570) and add it to both sides. Add '0.7901234570' to each side of the equation. -1.777777778r + 0.7901234570 + r2 = -1 + 0.7901234570 Reorder the terms: 0.7901234570 + -1.777777778r + r2 = -1 + 0.7901234570 Combine like terms: -1 + 0.7901234570 = -0.209876543 0.7901234570 + -1.777777778r + r2 = -0.209876543 Factor a perfect square on the left side: (r + -0.888888889)(r + -0.888888889) = -0.209876543 Can't calculate square root of the right side. The solution to this equation could not be determined.
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