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Simplifying 4x2 = 18x + -81 Reorder the terms: 4x2 = -81 + 18x Solving 4x2 = -81 + 18x Solving for variable 'x'. Reorder the terms: 81 + -18x + 4x2 = -81 + 18x + 81 + -18x Reorder the terms: 81 + -18x + 4x2 = -81 + 81 + 18x + -18x Combine like terms: -81 + 81 = 0 81 + -18x + 4x2 = 0 + 18x + -18x 81 + -18x + 4x2 = 18x + -18x Combine like terms: 18x + -18x = 0 81 + -18x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 20.25 + -4.5x + x2 = 0 Move the constant term to the right: Add '-20.25' to each side of the equation. 20.25 + -4.5x + -20.25 + x2 = 0 + -20.25 Reorder the terms: 20.25 + -20.25 + -4.5x + x2 = 0 + -20.25 Combine like terms: 20.25 + -20.25 = 0.00 0.00 + -4.5x + x2 = 0 + -20.25 -4.5x + x2 = 0 + -20.25 Combine like terms: 0 + -20.25 = -20.25 -4.5x + x2 = -20.25 The x term is -4.5x. Take half its coefficient (-2.25). Square it (5.0625) and add it to both sides. Add '5.0625' to each side of the equation. -4.5x + 5.0625 + x2 = -20.25 + 5.0625 Reorder the terms: 5.0625 + -4.5x + x2 = -20.25 + 5.0625 Combine like terms: -20.25 + 5.0625 = -15.1875 5.0625 + -4.5x + x2 = -15.1875 Factor a perfect square on the left side: (x + -2.25)(x + -2.25) = -15.1875 Can't calculate square root of the right side. The solution to this equation could not be determined.
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