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Simplifying x2 + -18x + 84 = 0 Reorder the terms: 84 + -18x + x2 = 0 Solving 84 + -18x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-84' to each side of the equation. 84 + -18x + -84 + x2 = 0 + -84 Reorder the terms: 84 + -84 + -18x + x2 = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -18x + x2 = 0 + -84 -18x + x2 = 0 + -84 Combine like terms: 0 + -84 = -84 -18x + x2 = -84 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 = -84 + 81 Reorder the terms: 81 + -18x + x2 = -84 + 81 Combine like terms: -84 + 81 = -3 81 + -18x + x2 = -3 Factor a perfect square on the left side: (x + -9)(x + -9) = -3 Can't calculate square root of the right side. The solution to this equation could not be determined.
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