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Simplifying -9x2 + 4.15x + -4 = 0 Reorder the terms: -4 + 4.15x + -9x2 = 0 Solving -4 + 4.15x + -9x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -9 the coefficient of the squared term: Divide each side by '-9'. 0.4444444444 + -0.4611111111x + x2 = 0 Move the constant term to the right: Add '-0.4444444444' to each side of the equation. 0.4444444444 + -0.4611111111x + -0.4444444444 + x2 = 0 + -0.4444444444 Reorder the terms: 0.4444444444 + -0.4444444444 + -0.4611111111x + x2 = 0 + -0.4444444444 Combine like terms: 0.4444444444 + -0.4444444444 = 0.0000000000 0.0000000000 + -0.4611111111x + x2 = 0 + -0.4444444444 -0.4611111111x + x2 = 0 + -0.4444444444 Combine like terms: 0 + -0.4444444444 = -0.4444444444 -0.4611111111x + x2 = -0.4444444444 The x term is -0.4611111111x. Take half its coefficient (-0.2305555556). Square it (0.05315586422) and add it to both sides. Add '0.05315586422' to each side of the equation. -0.4611111111x + 0.05315586422 + x2 = -0.4444444444 + 0.05315586422 Reorder the terms: 0.05315586422 + -0.4611111111x + x2 = -0.4444444444 + 0.05315586422 Combine like terms: -0.4444444444 + 0.05315586422 = -0.39128858018 0.05315586422 + -0.4611111111x + x2 = -0.39128858018 Factor a perfect square on the left side: (x + -0.2305555556)(x + -0.2305555556) = -0.39128858018 Can't calculate square root of the right side. The solution to this equation could not be determined.
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