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Simplifying 8x2 + 20x + -49 = 0 Reorder the terms: -49 + 20x + 8x2 = 0 Solving -49 + 20x + 8x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 8 the coefficient of the squared term: Divide each side by '8'. -6.125 + 2.5x + x2 = 0 Move the constant term to the right: Add '6.125' to each side of the equation. -6.125 + 2.5x + 6.125 + x2 = 0 + 6.125 Reorder the terms: -6.125 + 6.125 + 2.5x + x2 = 0 + 6.125 Combine like terms: -6.125 + 6.125 = 0.000 0.000 + 2.5x + x2 = 0 + 6.125 2.5x + x2 = 0 + 6.125 Combine like terms: 0 + 6.125 = 6.125 2.5x + x2 = 6.125 The x term is 2.5x. Take half its coefficient (1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. 2.5x + 1.5625 + x2 = 6.125 + 1.5625 Reorder the terms: 1.5625 + 2.5x + x2 = 6.125 + 1.5625 Combine like terms: 6.125 + 1.5625 = 7.6875 1.5625 + 2.5x + x2 = 7.6875 Factor a perfect square on the left side: (x + 1.25)(x + 1.25) = 7.6875 Calculate the square root of the right side: 2.772634127 Break this problem into two subproblems by setting (x + 1.25) equal to 2.772634127 and -2.772634127.Subproblem 1
x + 1.25 = 2.772634127 Simplifying x + 1.25 = 2.772634127 Reorder the terms: 1.25 + x = 2.772634127 Solving 1.25 + x = 2.772634127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 2.772634127 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 2.772634127 + -1.25 x = 2.772634127 + -1.25 Combine like terms: 2.772634127 + -1.25 = 1.522634127 x = 1.522634127 Simplifying x = 1.522634127Subproblem 2
x + 1.25 = -2.772634127 Simplifying x + 1.25 = -2.772634127 Reorder the terms: 1.25 + x = -2.772634127 Solving 1.25 + x = -2.772634127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -2.772634127 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -2.772634127 + -1.25 x = -2.772634127 + -1.25 Combine like terms: -2.772634127 + -1.25 = -4.022634127 x = -4.022634127 Simplifying x = -4.022634127Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.522634127, -4.022634127}
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