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Simplifying (x2) + (18x) + (90) = 0 x2 + (18x) + (90) = 0 x2 + (18x) + 90 = 0 Reorder the terms: 90 + (18x) + x2 = 0 Solving 90 + (18x) + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-90' to each side of the equation. 90 + (18x) + -90 + x2 = 0 + -90 Reorder the terms: 90 + -90 + (18x) + x2 = 0 + -90 Combine like terms: 90 + -90 = 0 0 + (18x) + x2 = 0 + -90 (18x) + x2 = 0 + -90 Combine like terms: 0 + -90 = -90 (18x) + x2 = -90 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 = -90 + 81 Reorder the terms: 81 + (18x) + x2 = -90 + 81 Combine like terms: -90 + 81 = -9 81 + (18x) + x2 = -9 Factor a perfect square on the left side: (x + 9)(x + 9) = -9 Can't calculate square root of the right side. The solution to this equation could not be determined.
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