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Simplifying x2 + -3x + 18 = 0 Reorder the terms: 18 + -3x + x2 = 0 Solving 18 + -3x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-18' to each side of the equation. 18 + -3x + -18 + x2 = 0 + -18 Reorder the terms: 18 + -18 + -3x + x2 = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -3x + x2 = 0 + -18 -3x + x2 = 0 + -18 Combine like terms: 0 + -18 = -18 -3x + x2 = -18 The x term is -3x. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3x + 2.25 + x2 = -18 + 2.25 Reorder the terms: 2.25 + -3x + x2 = -18 + 2.25 Combine like terms: -18 + 2.25 = -15.75 2.25 + -3x + x2 = -15.75 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = -15.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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