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Simplifying 4x2 + -31x + 8 = 0 Reorder the terms: 8 + -31x + 4x2 = 0 Solving 8 + -31x + 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'. 2 + -7.75x + x2 = 0 Move the constant term to the right: Add '-2' to each side of the equation. 2 + -7.75x + -2 + x2 = 0 + -2 Reorder the terms: 2 + -2 + -7.75x + x2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -7.75x + x2 = 0 + -2 -7.75x + x2 = 0 + -2 Combine like terms: 0 + -2 = -2 -7.75x + x2 = -2 The x term is -7.75x. Take half its coefficient (-3.875). Square it (15.015625) and add it to both sides. Add '15.015625' to each side of the equation. -7.75x + 15.015625 + x2 = -2 + 15.015625 Reorder the terms: 15.015625 + -7.75x + x2 = -2 + 15.015625 Combine like terms: -2 + 15.015625 = 13.015625 15.015625 + -7.75x + x2 = 13.015625 Factor a perfect square on the left side: (x + -3.875)(x + -3.875) = 13.015625 Calculate the square root of the right side: 3.607717422 Break this problem into two subproblems by setting (x + -3.875) equal to 3.607717422 and -3.607717422.Subproblem 1
x + -3.875 = 3.607717422 Simplifying x + -3.875 = 3.607717422 Reorder the terms: -3.875 + x = 3.607717422 Solving -3.875 + x = 3.607717422 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.875' to each side of the equation. -3.875 + 3.875 + x = 3.607717422 + 3.875 Combine like terms: -3.875 + 3.875 = 0.000 0.000 + x = 3.607717422 + 3.875 x = 3.607717422 + 3.875 Combine like terms: 3.607717422 + 3.875 = 7.482717422 x = 7.482717422 Simplifying x = 7.482717422Subproblem 2
x + -3.875 = -3.607717422 Simplifying x + -3.875 = -3.607717422 Reorder the terms: -3.875 + x = -3.607717422 Solving -3.875 + x = -3.607717422 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.875' to each side of the equation. -3.875 + 3.875 + x = -3.607717422 + 3.875 Combine like terms: -3.875 + 3.875 = 0.000 0.000 + x = -3.607717422 + 3.875 x = -3.607717422 + 3.875 Combine like terms: -3.607717422 + 3.875 = 0.267282578 x = 0.267282578 Simplifying x = 0.267282578Solution
The solution to the problem is based on the solutions from the subproblems. x = {7.482717422, 0.267282578}
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