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Simplifying -4x2 + 15x + 2 = 0 Reorder the terms: 2 + 15x + -4x2 = 0 Solving 2 + 15x + -4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. -0.5 + -3.75x + x2 = 0 Move the constant term to the right: Add '0.5' to each side of the equation. -0.5 + -3.75x + 0.5 + x2 = 0 + 0.5 Reorder the terms: -0.5 + 0.5 + -3.75x + x2 = 0 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + -3.75x + x2 = 0 + 0.5 -3.75x + x2 = 0 + 0.5 Combine like terms: 0 + 0.5 = 0.5 -3.75x + x2 = 0.5 The x term is -3.75x. Take half its coefficient (-1.875). Square it (3.515625) and add it to both sides. Add '3.515625' to each side of the equation. -3.75x + 3.515625 + x2 = 0.5 + 3.515625 Reorder the terms: 3.515625 + -3.75x + x2 = 0.5 + 3.515625 Combine like terms: 0.5 + 3.515625 = 4.015625 3.515625 + -3.75x + x2 = 4.015625 Factor a perfect square on the left side: (x + -1.875)(x + -1.875) = 4.015625 Calculate the square root of the right side: 2.003902443 Break this problem into two subproblems by setting (x + -1.875) equal to 2.003902443 and -2.003902443.Subproblem 1
x + -1.875 = 2.003902443 Simplifying x + -1.875 = 2.003902443 Reorder the terms: -1.875 + x = 2.003902443 Solving -1.875 + x = 2.003902443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 2.003902443 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 2.003902443 + 1.875 x = 2.003902443 + 1.875 Combine like terms: 2.003902443 + 1.875 = 3.878902443 x = 3.878902443 Simplifying x = 3.878902443Subproblem 2
x + -1.875 = -2.003902443 Simplifying x + -1.875 = -2.003902443 Reorder the terms: -1.875 + x = -2.003902443 Solving -1.875 + x = -2.003902443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -2.003902443 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -2.003902443 + 1.875 x = -2.003902443 + 1.875 Combine like terms: -2.003902443 + 1.875 = -0.128902443 x = -0.128902443 Simplifying x = -0.128902443Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.878902443, -0.128902443}
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