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Simplifying -1x2 + -20x + 80 = 0 Reorder the terms: 80 + -20x + -1x2 = 0 Solving 80 + -20x + -1x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -80 + 20x + x2 = 0 Move the constant term to the right: Add '80' to each side of the equation. -80 + 20x + 80 + x2 = 0 + 80 Reorder the terms: -80 + 80 + 20x + x2 = 0 + 80 Combine like terms: -80 + 80 = 0 0 + 20x + x2 = 0 + 80 20x + x2 = 0 + 80 Combine like terms: 0 + 80 = 80 20x + x2 = 80 The x term is 20x. Take half its coefficient (10). Square it (100) and add it to both sides. Add '100' to each side of the equation. 20x + 100 + x2 = 80 + 100 Reorder the terms: 100 + 20x + x2 = 80 + 100 Combine like terms: 80 + 100 = 180 100 + 20x + x2 = 180 Factor a perfect square on the left side: (x + 10)(x + 10) = 180 Calculate the square root of the right side: 13.416407865 Break this problem into two subproblems by setting (x + 10) equal to 13.416407865 and -13.416407865.Subproblem 1
x + 10 = 13.416407865 Simplifying x + 10 = 13.416407865 Reorder the terms: 10 + x = 13.416407865 Solving 10 + x = 13.416407865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 13.416407865 + -10 Combine like terms: 10 + -10 = 0 0 + x = 13.416407865 + -10 x = 13.416407865 + -10 Combine like terms: 13.416407865 + -10 = 3.416407865 x = 3.416407865 Simplifying x = 3.416407865Subproblem 2
x + 10 = -13.416407865 Simplifying x + 10 = -13.416407865 Reorder the terms: 10 + x = -13.416407865 Solving 10 + x = -13.416407865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -13.416407865 + -10 Combine like terms: 10 + -10 = 0 0 + x = -13.416407865 + -10 x = -13.416407865 + -10 Combine like terms: -13.416407865 + -10 = -23.416407865 x = -23.416407865 Simplifying x = -23.416407865Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.416407865, -23.416407865}
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