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Simplifying 15 = 3x2 + -4x + 18 Reorder the terms: 15 = 18 + -4x + 3x2 Solving 15 = 18 + -4x + 3x2 Solving for variable 'x'. Combine like terms: 15 + -18 = -3 -3 + 4x + -3x2 = 18 + -4x + 3x2 + -18 + 4x + -3x2 Reorder the terms: -3 + 4x + -3x2 = 18 + -18 + -4x + 4x + 3x2 + -3x2 Combine like terms: 18 + -18 = 0 -3 + 4x + -3x2 = 0 + -4x + 4x + 3x2 + -3x2 -3 + 4x + -3x2 = -4x + 4x + 3x2 + -3x2 Combine like terms: -4x + 4x = 0 -3 + 4x + -3x2 = 0 + 3x2 + -3x2 -3 + 4x + -3x2 = 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -3 + 4x + -3x2 = 0 Begin completing the square. Divide all terms by -3 the coefficient of the squared term: Divide each side by '-3'. 1 + -1.333333333x + x2 = 0 Move the constant term to the right: Add '-1' to each side of the equation. 1 + -1.333333333x + -1 + x2 = 0 + -1 Reorder the terms: 1 + -1 + -1.333333333x + x2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1.333333333x + x2 = 0 + -1 -1.333333333x + x2 = 0 + -1 Combine like terms: 0 + -1 = -1 -1.333333333x + x2 = -1 The x term is -1.333333333x. Take half its coefficient (-0.6666666665). Square it (0.4444444442) and add it to both sides. Add '0.4444444442' to each side of the equation. -1.333333333x + 0.4444444442 + x2 = -1 + 0.4444444442 Reorder the terms: 0.4444444442 + -1.333333333x + x2 = -1 + 0.4444444442 Combine like terms: -1 + 0.4444444442 = -0.5555555558 0.4444444442 + -1.333333333x + x2 = -0.5555555558 Factor a perfect square on the left side: (x + -0.6666666665)(x + -0.6666666665) = -0.5555555558 Can't calculate square root of the right side. The solution to this equation could not be determined.
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