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Simplifying 0 = x2 + 4x + 15 Reorder the terms: 0 = 15 + 4x + x2 Solving 0 = 15 + 4x + x2 Solving for variable 'x'. Combine like terms: 0 + -15 = -15 -15 + -4x + -1x2 = 15 + 4x + x2 + -15 + -4x + -1x2 Reorder the terms: -15 + -4x + -1x2 = 15 + -15 + 4x + -4x + x2 + -1x2 Combine like terms: 15 + -15 = 0 -15 + -4x + -1x2 = 0 + 4x + -4x + x2 + -1x2 -15 + -4x + -1x2 = 4x + -4x + x2 + -1x2 Combine like terms: 4x + -4x = 0 -15 + -4x + -1x2 = 0 + x2 + -1x2 -15 + -4x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -15 + -4x + -1x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(15 + 4x + x2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(15 + 4x + x2)' equal to zero and attempt to solve: Simplifying 15 + 4x + x2 = 0 Solving 15 + 4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-15' to each side of the equation. 15 + 4x + -15 + x2 = 0 + -15 Reorder the terms: 15 + -15 + 4x + x2 = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 4x + x2 = 0 + -15 4x + x2 = 0 + -15 Combine like terms: 0 + -15 = -15 4x + x2 = -15 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = -15 + 4 Reorder the terms: 4 + 4x + x2 = -15 + 4 Combine like terms: -15 + 4 = -11 4 + 4x + x2 = -11 Factor a perfect square on the left side: (x + 2)(x + 2) = -11 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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