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Simplifying -4x2 + 4x + 15 = 20 Reorder the terms: 15 + 4x + -4x2 = 20 Solving 15 + 4x + -4x2 = 20 Solving for variable 'x'. Reorder the terms: 15 + -20 + 4x + -4x2 = 20 + -20 Combine like terms: 15 + -20 = -5 -5 + 4x + -4x2 = 20 + -20 Combine like terms: 20 + -20 = 0 -5 + 4x + -4x2 = 0 Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. 1.25 + -1x + x2 = 0 Move the constant term to the right: Add '-1.25' to each side of the equation. 1.25 + -1x + -1.25 + x2 = 0 + -1.25 Reorder the terms: 1.25 + -1.25 + -1x + x2 = 0 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + -1x + x2 = 0 + -1.25 -1x + x2 = 0 + -1.25 Combine like terms: 0 + -1.25 = -1.25 -1x + x2 = -1.25 The x term is -1x. 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. -1x + 0.25 + x2 = -1.25 + 0.25 Reorder the terms: 0.25 + -1x + x2 = -1.25 + 0.25 Combine like terms: -1.25 + 0.25 = -1 0.25 + -1x + x2 = -1 Factor a perfect square on the left side: (x + -0.5)(x + -0.5) = -1 Can't calculate square root of the right side. The solution to this equation could not be determined.
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