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Simplifying x2 + -18x + 81 = -25 Reorder the terms: 81 + -18x + x2 = -25 Solving 81 + -18x + x2 = -25 Solving for variable 'x'. Reorder the terms: 81 + 25 + -18x + x2 = -25 + 25 Combine like terms: 81 + 25 = 106 106 + -18x + x2 = -25 + 25 Combine like terms: -25 + 25 = 0 106 + -18x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-106' to each side of the equation. 106 + -18x + -106 + x2 = 0 + -106 Reorder the terms: 106 + -106 + -18x + x2 = 0 + -106 Combine like terms: 106 + -106 = 0 0 + -18x + x2 = 0 + -106 -18x + x2 = 0 + -106 Combine like terms: 0 + -106 = -106 -18x + x2 = -106 The x term is -18x. Take half its coefficient (-9). Square it (81) and add it to both sides. Add '81' to each side of the equation. -18x + 81 + x2 = -106 + 81 Reorder the terms: 81 + -18x + x2 = -106 + 81 Combine like terms: -106 + 81 = -25 81 + -18x + x2 = -25 Factor a perfect square on the left side: (x + -9)(x + -9) = -25 Can't calculate square root of the right side. The solution to this equation could not be determined.
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