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Simplifying -0.67x2 + 4x + -9 = 0 Reorder the terms: -9 + 4x + -0.67x2 = 0 Solving -9 + 4x + -0.67x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -0.67 the coefficient of the squared term: Divide each side by '-0.67'. 13.43283582 + -5.970149254x + x2 = 0 Move the constant term to the right: Add '-13.43283582' to each side of the equation. 13.43283582 + -5.970149254x + -13.43283582 + x2 = 0 + -13.43283582 Reorder the terms: 13.43283582 + -13.43283582 + -5.970149254x + x2 = 0 + -13.43283582 Combine like terms: 13.43283582 + -13.43283582 = 0.00000000 0.00000000 + -5.970149254x + x2 = 0 + -13.43283582 -5.970149254x + x2 = 0 + -13.43283582 Combine like terms: 0 + -13.43283582 = -13.43283582 -5.970149254x + x2 = -13.43283582 The x term is -5.970149254x. Take half its coefficient (-2.985074627). Square it (8.910670529) and add it to both sides. Add '8.910670529' to each side of the equation. -5.970149254x + 8.910670529 + x2 = -13.43283582 + 8.910670529 Reorder the terms: 8.910670529 + -5.970149254x + x2 = -13.43283582 + 8.910670529 Combine like terms: -13.43283582 + 8.910670529 = -4.522165291 8.910670529 + -5.970149254x + x2 = -4.522165291 Factor a perfect square on the left side: (x + -2.985074627)(x + -2.985074627) = -4.522165291 Can't calculate square root of the right side. The solution to this equation could not be determined.
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