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Simplifying -5x2 + 4x = 91 Reorder the terms: 4x + -5x2 = 91 Solving 4x + -5x2 = 91 Solving for variable 'x'. Reorder the terms: -91 + 4x + -5x2 = 91 + -91 Combine like terms: 91 + -91 = 0 -91 + 4x + -5x2 = 0 Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. 18.2 + -0.8x + x2 = 0 Move the constant term to the right: Add '-18.2' to each side of the equation. 18.2 + -0.8x + -18.2 + x2 = 0 + -18.2 Reorder the terms: 18.2 + -18.2 + -0.8x + x2 = 0 + -18.2 Combine like terms: 18.2 + -18.2 = 0.0 0.0 + -0.8x + x2 = 0 + -18.2 -0.8x + x2 = 0 + -18.2 Combine like terms: 0 + -18.2 = -18.2 -0.8x + x2 = -18.2 The x term is -0.8x. Take half its coefficient (-0.4). Square it (0.16) and add it to both sides. Add '0.16' to each side of the equation. -0.8x + 0.16 + x2 = -18.2 + 0.16 Reorder the terms: 0.16 + -0.8x + x2 = -18.2 + 0.16 Combine like terms: -18.2 + 0.16 = -18.04 0.16 + -0.8x + x2 = -18.04 Factor a perfect square on the left side: (x + -0.4)(x + -0.4) = -18.04 Can't calculate square root of the right side. The solution to this equation could not be determined.
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