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Simplifying -2x2 + -10x + 7 = 0 Reorder the terms: 7 + -10x + -2x2 = 0 Solving 7 + -10x + -2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. -3.5 + 5x + x2 = 0 Move the constant term to the right: Add '3.5' to each side of the equation. -3.5 + 5x + 3.5 + x2 = 0 + 3.5 Reorder the terms: -3.5 + 3.5 + 5x + x2 = 0 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + 5x + x2 = 0 + 3.5 5x + x2 = 0 + 3.5 Combine like terms: 0 + 3.5 = 3.5 5x + x2 = 3.5 The x term is 5x. Take half its coefficient (2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. 5x + 6.25 + x2 = 3.5 + 6.25 Reorder the terms: 6.25 + 5x + x2 = 3.5 + 6.25 Combine like terms: 3.5 + 6.25 = 9.75 6.25 + 5x + x2 = 9.75 Factor a perfect square on the left side: (x + 2.5)(x + 2.5) = 9.75 Calculate the square root of the right side: 3.122498999 Break this problem into two subproblems by setting (x + 2.5) equal to 3.122498999 and -3.122498999.Subproblem 1
x + 2.5 = 3.122498999 Simplifying x + 2.5 = 3.122498999 Reorder the terms: 2.5 + x = 3.122498999 Solving 2.5 + x = 3.122498999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 3.122498999 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 3.122498999 + -2.5 x = 3.122498999 + -2.5 Combine like terms: 3.122498999 + -2.5 = 0.622498999 x = 0.622498999 Simplifying x = 0.622498999Subproblem 2
x + 2.5 = -3.122498999 Simplifying x + 2.5 = -3.122498999 Reorder the terms: 2.5 + x = -3.122498999 Solving 2.5 + x = -3.122498999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -3.122498999 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -3.122498999 + -2.5 x = -3.122498999 + -2.5 Combine like terms: -3.122498999 + -2.5 = -5.622498999 x = -5.622498999 Simplifying x = -5.622498999Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.622498999, -5.622498999}
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