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Simplifying x2 + -4x + -15 = 16 Reorder the terms: -15 + -4x + x2 = 16 Solving -15 + -4x + x2 = 16 Solving for variable 'x'. Reorder the terms: -15 + -16 + -4x + x2 = 16 + -16 Combine like terms: -15 + -16 = -31 -31 + -4x + x2 = 16 + -16 Combine like terms: 16 + -16 = 0 -31 + -4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '31' to each side of the equation. -31 + -4x + 31 + x2 = 0 + 31 Reorder the terms: -31 + 31 + -4x + x2 = 0 + 31 Combine like terms: -31 + 31 = 0 0 + -4x + x2 = 0 + 31 -4x + x2 = 0 + 31 Combine like terms: 0 + 31 = 31 -4x + x2 = 31 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 = 31 + 4 Reorder the terms: 4 + -4x + x2 = 31 + 4 Combine like terms: 31 + 4 = 35 4 + -4x + x2 = 35 Factor a perfect square on the left side: (x + -2)(x + -2) = 35 Calculate the square root of the right side: 5.916079783 Break this problem into two subproblems by setting (x + -2) equal to 5.916079783 and -5.916079783.Subproblem 1
x + -2 = 5.916079783 Simplifying x + -2 = 5.916079783 Reorder the terms: -2 + x = 5.916079783 Solving -2 + x = 5.916079783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 5.916079783 + 2 Combine like terms: -2 + 2 = 0 0 + x = 5.916079783 + 2 x = 5.916079783 + 2 Combine like terms: 5.916079783 + 2 = 7.916079783 x = 7.916079783 Simplifying x = 7.916079783Subproblem 2
x + -2 = -5.916079783 Simplifying x + -2 = -5.916079783 Reorder the terms: -2 + x = -5.916079783 Solving -2 + x = -5.916079783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -5.916079783 + 2 Combine like terms: -2 + 2 = 0 0 + x = -5.916079783 + 2 x = -5.916079783 + 2 Combine like terms: -5.916079783 + 2 = -3.916079783 x = -3.916079783 Simplifying x = -3.916079783Solution
The solution to the problem is based on the solutions from the subproblems. x = {7.916079783, -3.916079783}
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