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Simplifying x = x2 + 8x + 15 Reorder the terms: x = 15 + 8x + x2 Solving x = 15 + 8x + x2 Solving for variable 'x'. Reorder the terms: -15 + x + -8x + -1x2 = 15 + 8x + x2 + -15 + -8x + -1x2 Combine like terms: x + -8x = -7x -15 + -7x + -1x2 = 15 + 8x + x2 + -15 + -8x + -1x2 Reorder the terms: -15 + -7x + -1x2 = 15 + -15 + 8x + -8x + x2 + -1x2 Combine like terms: 15 + -15 = 0 -15 + -7x + -1x2 = 0 + 8x + -8x + x2 + -1x2 -15 + -7x + -1x2 = 8x + -8x + x2 + -1x2 Combine like terms: 8x + -8x = 0 -15 + -7x + -1x2 = 0 + x2 + -1x2 -15 + -7x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -15 + -7x + -1x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(15 + 7x + x2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(15 + 7x + x2)' equal to zero and attempt to solve: Simplifying 15 + 7x + x2 = 0 Solving 15 + 7x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-15' to each side of the equation. 15 + 7x + -15 + x2 = 0 + -15 Reorder the terms: 15 + -15 + 7x + x2 = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 7x + x2 = 0 + -15 7x + x2 = 0 + -15 Combine like terms: 0 + -15 = -15 7x + x2 = -15 The x term is 7x. Take half its coefficient (3.5). Square it (12.25) and add it to both sides. Add '12.25' to each side of the equation. 7x + 12.25 + x2 = -15 + 12.25 Reorder the terms: 12.25 + 7x + x2 = -15 + 12.25 Combine like terms: -15 + 12.25 = -2.75 12.25 + 7x + x2 = -2.75 Factor a perfect square on the left side: (x + 3.5)(x + 3.5) = -2.75 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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