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Simplifying 5x2 + -20x + 7 = 0 Reorder the terms: 7 + -20x + 5x2 = 0 Solving 7 + -20x + 5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 1.4 + -4x + x2 = 0 Move the constant term to the right: Add '-1.4' to each side of the equation. 1.4 + -4x + -1.4 + x2 = 0 + -1.4 Reorder the terms: 1.4 + -1.4 + -4x + x2 = 0 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + -4x + x2 = 0 + -1.4 -4x + x2 = 0 + -1.4 Combine like terms: 0 + -1.4 = -1.4 -4x + x2 = -1.4 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 = -1.4 + 4 Reorder the terms: 4 + -4x + x2 = -1.4 + 4 Combine like terms: -1.4 + 4 = 2.6 4 + -4x + x2 = 2.6 Factor a perfect square on the left side: (x + -2)(x + -2) = 2.6 Calculate the square root of the right side: 1.61245155 Break this problem into two subproblems by setting (x + -2) equal to 1.61245155 and -1.61245155.Subproblem 1
x + -2 = 1.61245155 Simplifying x + -2 = 1.61245155 Reorder the terms: -2 + x = 1.61245155 Solving -2 + x = 1.61245155 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 = 1.61245155 + 2 Combine like terms: -2 + 2 = 0 0 + x = 1.61245155 + 2 x = 1.61245155 + 2 Combine like terms: 1.61245155 + 2 = 3.61245155 x = 3.61245155 Simplifying x = 3.61245155Subproblem 2
x + -2 = -1.61245155 Simplifying x + -2 = -1.61245155 Reorder the terms: -2 + x = -1.61245155 Solving -2 + x = -1.61245155 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 = -1.61245155 + 2 Combine like terms: -2 + 2 = 0 0 + x = -1.61245155 + 2 x = -1.61245155 + 2 Combine like terms: -1.61245155 + 2 = 0.38754845 x = 0.38754845 Simplifying x = 0.38754845Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.61245155, 0.38754845}
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