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Simplifying 2x2 + 4x = -78 Reorder the terms: 4x + 2x2 = -78 Solving 4x + 2x2 = -78 Solving for variable 'x'. Reorder the terms: 78 + 4x + 2x2 = -78 + 78 Combine like terms: -78 + 78 = 0 78 + 4x + 2x2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(39 + 2x + x2) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(39 + 2x + x2)' equal to zero and attempt to solve: Simplifying 39 + 2x + x2 = 0 Solving 39 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-39' to each side of the equation. 39 + 2x + -39 + x2 = 0 + -39 Reorder the terms: 39 + -39 + 2x + x2 = 0 + -39 Combine like terms: 39 + -39 = 0 0 + 2x + x2 = 0 + -39 2x + x2 = 0 + -39 Combine like terms: 0 + -39 = -39 2x + x2 = -39 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = -39 + 1 Reorder the terms: 1 + 2x + x2 = -39 + 1 Combine like terms: -39 + 1 = -38 1 + 2x + x2 = -38 Factor a perfect square on the left side: (x + 1)(x + 1) = -38 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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