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Simplifying -4x2 + 8x = 9 Reorder the terms: 8x + -4x2 = 9 Solving 8x + -4x2 = 9 Solving for variable 'x'. Reorder the terms: -9 + 8x + -4x2 = 9 + -9 Combine like terms: 9 + -9 = 0 -9 + 8x + -4x2 = 0 Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. 2.25 + -2x + x2 = 0 Move the constant term to the right: Add '-2.25' to each side of the equation. 2.25 + -2x + -2.25 + x2 = 0 + -2.25 Reorder the terms: 2.25 + -2.25 + -2x + x2 = 0 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + -2x + x2 = 0 + -2.25 -2x + x2 = 0 + -2.25 Combine like terms: 0 + -2.25 = -2.25 -2x + x2 = -2.25 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x2 = -2.25 + 1 Reorder the terms: 1 + -2x + x2 = -2.25 + 1 Combine like terms: -2.25 + 1 = -1.25 1 + -2x + x2 = -1.25 Factor a perfect square on the left side: (x + -1)(x + -1) = -1.25 Can't calculate square root of the right side. The solution to this equation could not be determined.
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