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Simplifying -0.4x2 + 0.25x + -0.7 = 0 Reorder the terms: -0.7 + 0.25x + -0.4x2 = 0 Solving -0.7 + 0.25x + -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'. 1.75 + -0.625x + x2 = 0 Move the constant term to the right: Add '-1.75' to each side of the equation. 1.75 + -0.625x + -1.75 + x2 = 0 + -1.75 Reorder the terms: 1.75 + -1.75 + -0.625x + x2 = 0 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + -0.625x + x2 = 0 + -1.75 -0.625x + x2 = 0 + -1.75 Combine like terms: 0 + -1.75 = -1.75 -0.625x + x2 = -1.75 The x term is -0.625x. Take half its coefficient (-0.3125). Square it (0.09765625) and add it to both sides. Add '0.09765625' to each side of the equation. -0.625x + 0.09765625 + x2 = -1.75 + 0.09765625 Reorder the terms: 0.09765625 + -0.625x + x2 = -1.75 + 0.09765625 Combine like terms: -1.75 + 0.09765625 = -1.65234375 0.09765625 + -0.625x + x2 = -1.65234375 Factor a perfect square on the left side: (x + -0.3125)(x + -0.3125) = -1.65234375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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