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Simplifying 0 = x2 + 3x + 18 Reorder the terms: 0 = 18 + 3x + x2 Solving 0 = 18 + 3x + x2 Solving for variable 'x'. Combine like terms: 0 + -18 = -18 -18 + -3x + -1x2 = 18 + 3x + x2 + -18 + -3x + -1x2 Reorder the terms: -18 + -3x + -1x2 = 18 + -18 + 3x + -3x + x2 + -1x2 Combine like terms: 18 + -18 = 0 -18 + -3x + -1x2 = 0 + 3x + -3x + x2 + -1x2 -18 + -3x + -1x2 = 3x + -3x + x2 + -1x2 Combine like terms: 3x + -3x = 0 -18 + -3x + -1x2 = 0 + x2 + -1x2 -18 + -3x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -18 + -3x + -1x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(18 + 3x + x2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(18 + 3x + x2)' equal to zero and attempt to solve: Simplifying 18 + 3x + x2 = 0 Solving 18 + 3x + x2 = 0 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. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.
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