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Simplifying 0 = x2 + 5x + 15 Reorder the terms: 0 = 15 + 5x + x2 Solving 0 = 15 + 5x + x2 Solving for variable 'x'. Combine like terms: 0 + -15 = -15 -15 + -5x + -1x2 = 15 + 5x + x2 + -15 + -5x + -1x2 Reorder the terms: -15 + -5x + -1x2 = 15 + -15 + 5x + -5x + x2 + -1x2 Combine like terms: 15 + -15 = 0 -15 + -5x + -1x2 = 0 + 5x + -5x + x2 + -1x2 -15 + -5x + -1x2 = 5x + -5x + x2 + -1x2 Combine like terms: 5x + -5x = 0 -15 + -5x + -1x2 = 0 + x2 + -1x2 -15 + -5x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -15 + -5x + -1x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(15 + 5x + x2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(15 + 5x + x2)' equal to zero and attempt to solve: Simplifying 15 + 5x + x2 = 0 Solving 15 + 5x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-15' to each side of the equation. 15 + 5x + -15 + x2 = 0 + -15 Reorder the terms: 15 + -15 + 5x + x2 = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 5x + x2 = 0 + -15 5x + x2 = 0 + -15 Combine like terms: 0 + -15 = -15 5x + x2 = -15 The x term is 5x. Take half its coefficient (2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. 5x + 6.25 + x2 = -15 + 6.25 Reorder the terms: 6.25 + 5x + x2 = -15 + 6.25 Combine like terms: -15 + 6.25 = -8.75 6.25 + 5x + x2 = -8.75 Factor a perfect square on the left side: (x + 2.5)(x + 2.5) = -8.75 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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