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Simplifying 7x2 + -28x + 3 = 0 Reorder the terms: 3 + -28x + 7x2 = 0 Solving 3 + -28x + 7x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 7 the coefficient of the squared term: Divide each side by '7'. 0.4285714286 + -4x + x2 = 0 Move the constant term to the right: Add '-0.4285714286' to each side of the equation. 0.4285714286 + -4x + -0.4285714286 + x2 = 0 + -0.4285714286 Reorder the terms: 0.4285714286 + -0.4285714286 + -4x + x2 = 0 + -0.4285714286 Combine like terms: 0.4285714286 + -0.4285714286 = 0.0000000000 0.0000000000 + -4x + x2 = 0 + -0.4285714286 -4x + x2 = 0 + -0.4285714286 Combine like terms: 0 + -0.4285714286 = -0.4285714286 -4x + x2 = -0.4285714286 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 = -0.4285714286 + 4 Reorder the terms: 4 + -4x + x2 = -0.4285714286 + 4 Combine like terms: -0.4285714286 + 4 = 3.5714285714 4 + -4x + x2 = 3.5714285714 Factor a perfect square on the left side: (x + -2)(x + -2) = 3.5714285714 Calculate the square root of the right side: 1.889822365 Break this problem into two subproblems by setting (x + -2) equal to 1.889822365 and -1.889822365.Subproblem 1
x + -2 = 1.889822365 Simplifying x + -2 = 1.889822365 Reorder the terms: -2 + x = 1.889822365 Solving -2 + x = 1.889822365 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 = 1.889822365 + 2 Combine like terms: -2 + 2 = 0 0 + x = 1.889822365 + 2 x = 1.889822365 + 2 Combine like terms: 1.889822365 + 2 = 3.889822365 x = 3.889822365 Simplifying x = 3.889822365Subproblem 2
x + -2 = -1.889822365 Simplifying x + -2 = -1.889822365 Reorder the terms: -2 + x = -1.889822365 Solving -2 + x = -1.889822365 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 = -1.889822365 + 2 Combine like terms: -2 + 2 = 0 0 + x = -1.889822365 + 2 x = -1.889822365 + 2 Combine like terms: -1.889822365 + 2 = 0.110177635 x = 0.110177635 Simplifying x = 0.110177635Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.889822365, 0.110177635}
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