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Simplifying 7x2 + -1x + -80 = 0 Reorder the terms: -80 + -1x + 7x2 = 0 Solving -80 + -1x + 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'. -11.42857143 + -0.1428571429x + x2 = 0 Move the constant term to the right: Add '11.42857143' to each side of the equation. -11.42857143 + -0.1428571429x + 11.42857143 + x2 = 0 + 11.42857143 Reorder the terms: -11.42857143 + 11.42857143 + -0.1428571429x + x2 = 0 + 11.42857143 Combine like terms: -11.42857143 + 11.42857143 = 0.00000000 0.00000000 + -0.1428571429x + x2 = 0 + 11.42857143 -0.1428571429x + x2 = 0 + 11.42857143 Combine like terms: 0 + 11.42857143 = 11.42857143 -0.1428571429x + x2 = 11.42857143 The x term is -0.1428571429x. Take half its coefficient (-0.07142857145). Square it (0.005102040819) and add it to both sides. Add '0.005102040819' to each side of the equation. -0.1428571429x + 0.005102040819 + x2 = 11.42857143 + 0.005102040819 Reorder the terms: 0.005102040819 + -0.1428571429x + x2 = 11.42857143 + 0.005102040819 Combine like terms: 11.42857143 + 0.005102040819 = 11.433673470819 0.005102040819 + -0.1428571429x + x2 = 11.433673470819 Factor a perfect square on the left side: (x + -0.07142857145)(x + -0.07142857145) = 11.433673470819 Calculate the square root of the right side: 3.381371537 Break this problem into two subproblems by setting (x + -0.07142857145) equal to 3.381371537 and -3.381371537.Subproblem 1
x + -0.07142857145 = 3.381371537 Simplifying x + -0.07142857145 = 3.381371537 Reorder the terms: -0.07142857145 + x = 3.381371537 Solving -0.07142857145 + x = 3.381371537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.07142857145' to each side of the equation. -0.07142857145 + 0.07142857145 + x = 3.381371537 + 0.07142857145 Combine like terms: -0.07142857145 + 0.07142857145 = 0.00000000000 0.00000000000 + x = 3.381371537 + 0.07142857145 x = 3.381371537 + 0.07142857145 Combine like terms: 3.381371537 + 0.07142857145 = 3.45280010845 x = 3.45280010845 Simplifying x = 3.45280010845Subproblem 2
x + -0.07142857145 = -3.381371537 Simplifying x + -0.07142857145 = -3.381371537 Reorder the terms: -0.07142857145 + x = -3.381371537 Solving -0.07142857145 + x = -3.381371537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.07142857145' to each side of the equation. -0.07142857145 + 0.07142857145 + x = -3.381371537 + 0.07142857145 Combine like terms: -0.07142857145 + 0.07142857145 = 0.00000000000 0.00000000000 + x = -3.381371537 + 0.07142857145 x = -3.381371537 + 0.07142857145 Combine like terms: -3.381371537 + 0.07142857145 = -3.30994296555 x = -3.30994296555 Simplifying x = -3.30994296555Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.45280010845, -3.30994296555}
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