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Simplifying x2 + -18x + 81 = -12 Reorder the terms: 81 + -18x + x2 = -12 Solving 81 + -18x + x2 = -12 Solving for variable 'x'. Reorder the terms: 81 + 12 + -18x + x2 = -12 + 12 Combine like terms: 81 + 12 = 93 93 + -18x + x2 = -12 + 12 Combine like terms: -12 + 12 = 0 93 + -18x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-93' to each side of the equation. 93 + -18x + -93 + x2 = 0 + -93 Reorder the terms: 93 + -93 + -18x + x2 = 0 + -93 Combine like terms: 93 + -93 = 0 0 + -18x + x2 = 0 + -93 -18x + x2 = 0 + -93 Combine like terms: 0 + -93 = -93 -18x + x2 = -93 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 = -93 + 81 Reorder the terms: 81 + -18x + x2 = -93 + 81 Combine like terms: -93 + 81 = -12 81 + -18x + x2 = -12 Factor a perfect square on the left side: (x + -9)(x + -9) = -12 Can't calculate square root of the right side. The solution to this equation could not be determined.
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