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Simplifying x + -0.4x2 + -0.25 = 0 Reorder the terms: -0.25 + x + -0.4x2 = 0 Solving -0.25 + x + -0.4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -0.4 the coefficient of the squared term: Divide each side by '-0.4'. 0.625 + -2.5x + x2 = 0 Move the constant term to the right: Add '-0.625' to each side of the equation. 0.625 + -2.5x + -0.625 + x2 = 0 + -0.625 Reorder the terms: 0.625 + -0.625 + -2.5x + x2 = 0 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + -2.5x + x2 = 0 + -0.625 -2.5x + x2 = 0 + -0.625 Combine like terms: 0 + -0.625 = -0.625 -2.5x + x2 = -0.625 The x term is x. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. -2.5x + 0.25 + x2 = -0.625 + 0.25 Reorder the terms: 0.25 + -2.5x + x2 = -0.625 + 0.25 Combine like terms: -0.625 + 0.25 = -0.375 0.25 + -2.5x + x2 = -0.375 Factor a perfect square on the left side: (x + 0.5)(x + 0.5) = -0.375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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