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Simplifying -2x2 + 10x = 15 Reorder the terms: 10x + -2x2 = 15 Solving 10x + -2x2 = 15 Solving for variable 'x'. Reorder the terms: -15 + 10x + -2x2 = 15 + -15 Combine like terms: 15 + -15 = 0 -15 + 10x + -2x2 = 0 Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. 7.5 + -5x + x2 = 0 Move the constant term to the right: Add '-7.5' to each side of the equation. 7.5 + -5x + -7.5 + x2 = 0 + -7.5 Reorder the terms: 7.5 + -7.5 + -5x + x2 = 0 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + -5x + x2 = 0 + -7.5 -5x + x2 = 0 + -7.5 Combine like terms: 0 + -7.5 = -7.5 -5x + x2 = -7.5 The x term is -5x. Take half its coefficient (-2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. -5x + 6.25 + x2 = -7.5 + 6.25 Reorder the terms: 6.25 + -5x + x2 = -7.5 + 6.25 Combine like terms: -7.5 + 6.25 = -1.25 6.25 + -5x + x2 = -1.25 Factor a perfect square on the left side: (x + -2.5)(x + -2.5) = -1.25 Can't calculate square root of the right side. The solution to this equation could not be determined.
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