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Simplifying -2x2 + 7x = 9 Reorder the terms: 7x + -2x2 = 9 Solving 7x + -2x2 = 9 Solving for variable 'x'. Reorder the terms: -9 + 7x + -2x2 = 9 + -9 Combine like terms: 9 + -9 = 0 -9 + 7x + -2x2 = 0 Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. 4.5 + -3.5x + x2 = 0 Move the constant term to the right: Add '-4.5' to each side of the equation. 4.5 + -3.5x + -4.5 + x2 = 0 + -4.5 Reorder the terms: 4.5 + -4.5 + -3.5x + x2 = 0 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + -3.5x + x2 = 0 + -4.5 -3.5x + x2 = 0 + -4.5 Combine like terms: 0 + -4.5 = -4.5 -3.5x + x2 = -4.5 The x term is -3.5x. Take half its coefficient (-1.75). Square it (3.0625) and add it to both sides. Add '3.0625' to each side of the equation. -3.5x + 3.0625 + x2 = -4.5 + 3.0625 Reorder the terms: 3.0625 + -3.5x + x2 = -4.5 + 3.0625 Combine like terms: -4.5 + 3.0625 = -1.4375 3.0625 + -3.5x + x2 = -1.4375 Factor a perfect square on the left side: (x + -1.75)(x + -1.75) = -1.4375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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