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Simplifying 2x2 + -11x + 640 = 0 Reorder the terms: 640 + -11x + 2x2 = 0 Solving 640 + -11x + 2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 320 + -5.5x + x2 = 0 Move the constant term to the right: Add '-320' to each side of the equation. 320 + -5.5x + -320 + x2 = 0 + -320 Reorder the terms: 320 + -320 + -5.5x + x2 = 0 + -320 Combine like terms: 320 + -320 = 0 0 + -5.5x + x2 = 0 + -320 -5.5x + x2 = 0 + -320 Combine like terms: 0 + -320 = -320 -5.5x + x2 = -320 The x term is -5.5x. Take half its coefficient (-2.75). Square it (7.5625) and add it to both sides. Add '7.5625' to each side of the equation. -5.5x + 7.5625 + x2 = -320 + 7.5625 Reorder the terms: 7.5625 + -5.5x + x2 = -320 + 7.5625 Combine like terms: -320 + 7.5625 = -312.4375 7.5625 + -5.5x + x2 = -312.4375 Factor a perfect square on the left side: (x + -2.75)(x + -2.75) = -312.4375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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