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Simplifying 15 = 4x2 + -2x + 4 Reorder the terms: 15 = 4 + -2x + 4x2 Solving 15 = 4 + -2x + 4x2 Solving for variable 'x'. Combine like terms: 15 + -4 = 11 11 + 2x + -4x2 = 4 + -2x + 4x2 + -4 + 2x + -4x2 Reorder the terms: 11 + 2x + -4x2 = 4 + -4 + -2x + 2x + 4x2 + -4x2 Combine like terms: 4 + -4 = 0 11 + 2x + -4x2 = 0 + -2x + 2x + 4x2 + -4x2 11 + 2x + -4x2 = -2x + 2x + 4x2 + -4x2 Combine like terms: -2x + 2x = 0 11 + 2x + -4x2 = 0 + 4x2 + -4x2 11 + 2x + -4x2 = 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 11 + 2x + -4x2 = 0 Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. -2.75 + -0.5x + x2 = 0 Move the constant term to the right: Add '2.75' to each side of the equation. -2.75 + -0.5x + 2.75 + x2 = 0 + 2.75 Reorder the terms: -2.75 + 2.75 + -0.5x + x2 = 0 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + -0.5x + x2 = 0 + 2.75 -0.5x + x2 = 0 + 2.75 Combine like terms: 0 + 2.75 = 2.75 -0.5x + x2 = 2.75 The x term is -0.5x. Take half its coefficient (-0.25). Square it (0.0625) and add it to both sides. Add '0.0625' to each side of the equation. -0.5x + 0.0625 + x2 = 2.75 + 0.0625 Reorder the terms: 0.0625 + -0.5x + x2 = 2.75 + 0.0625 Combine like terms: 2.75 + 0.0625 = 2.8125 0.0625 + -0.5x + x2 = 2.8125 Factor a perfect square on the left side: (x + -0.25)(x + -0.25) = 2.8125 Calculate the square root of the right side: 1.677050983 Break this problem into two subproblems by setting (x + -0.25) equal to 1.677050983 and -1.677050983.Subproblem 1
x + -0.25 = 1.677050983 Simplifying x + -0.25 = 1.677050983 Reorder the terms: -0.25 + x = 1.677050983 Solving -0.25 + x = 1.677050983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 1.677050983 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 1.677050983 + 0.25 x = 1.677050983 + 0.25 Combine like terms: 1.677050983 + 0.25 = 1.927050983 x = 1.927050983 Simplifying x = 1.927050983Subproblem 2
x + -0.25 = -1.677050983 Simplifying x + -0.25 = -1.677050983 Reorder the terms: -0.25 + x = -1.677050983 Solving -0.25 + x = -1.677050983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -1.677050983 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -1.677050983 + 0.25 x = -1.677050983 + 0.25 Combine like terms: -1.677050983 + 0.25 = -1.427050983 x = -1.427050983 Simplifying x = -1.427050983Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.927050983, -1.427050983}
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