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Simplifying -4x2 = -13x + 15 Reorder the terms: -4x2 = 15 + -13x Solving -4x2 = 15 + -13x Solving for variable 'x'. Reorder the terms: -15 + 13x + -4x2 = 15 + -13x + -15 + 13x Reorder the terms: -15 + 13x + -4x2 = 15 + -15 + -13x + 13x Combine like terms: 15 + -15 = 0 -15 + 13x + -4x2 = 0 + -13x + 13x -15 + 13x + -4x2 = -13x + 13x Combine like terms: -13x + 13x = 0 -15 + 13x + -4x2 = 0 Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. 3.75 + -3.25x + x2 = 0 Move the constant term to the right: Add '-3.75' to each side of the equation. 3.75 + -3.25x + -3.75 + x2 = 0 + -3.75 Reorder the terms: 3.75 + -3.75 + -3.25x + x2 = 0 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + -3.25x + x2 = 0 + -3.75 -3.25x + x2 = 0 + -3.75 Combine like terms: 0 + -3.75 = -3.75 -3.25x + x2 = -3.75 The x term is -3.25x. Take half its coefficient (-1.625). Square it (2.640625) and add it to both sides. Add '2.640625' to each side of the equation. -3.25x + 2.640625 + x2 = -3.75 + 2.640625 Reorder the terms: 2.640625 + -3.25x + x2 = -3.75 + 2.640625 Combine like terms: -3.75 + 2.640625 = -1.109375 2.640625 + -3.25x + x2 = -1.109375 Factor a perfect square on the left side: (x + -1.625)(x + -1.625) = -1.109375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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