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Simplifying 0 = x2 + -1x + -405 Reorder the terms: 0 = -405 + -1x + x2 Solving 0 = -405 + -1x + x2 Solving for variable 'x'. Combine like terms: 0 + 405 = 405 405 + x + -1x2 = -405 + -1x + x2 + 405 + x + -1x2 Reorder the terms: 405 + x + -1x2 = -405 + 405 + -1x + x + x2 + -1x2 Combine like terms: -405 + 405 = 0 405 + x + -1x2 = 0 + -1x + x + x2 + -1x2 405 + x + -1x2 = -1x + x + x2 + -1x2 Combine like terms: -1x + x = 0 405 + x + -1x2 = 0 + x2 + -1x2 405 + x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 405 + x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -405 + -1x + x2 = 0 Move the constant term to the right: Add '405' to each side of the equation. -405 + -1x + 405 + x2 = 0 + 405 Reorder the terms: -405 + 405 + -1x + x2 = 0 + 405 Combine like terms: -405 + 405 = 0 0 + -1x + x2 = 0 + 405 -1x + x2 = 0 + 405 Combine like terms: 0 + 405 = 405 -1x + x2 = 405 The x term is x. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. -1x + 0.25 + x2 = 405 + 0.25 Reorder the terms: 0.25 + -1x + x2 = 405 + 0.25 Combine like terms: 405 + 0.25 = 405.25 0.25 + -1x + x2 = 405.25 Factor a perfect square on the left side: (x + 0.5)(x + 0.5) = 405.25 Calculate the square root of the right side: 20.130822139 Break this problem into two subproblems by setting (x + 0.5) equal to 20.130822139 and -20.130822139.Subproblem 1
x + 0.5 = 20.130822139 Simplifying x + 0.5 = 20.130822139 Reorder the terms: 0.5 + x = 20.130822139 Solving 0.5 + x = 20.130822139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 20.130822139 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 20.130822139 + -0.5 x = 20.130822139 + -0.5 Combine like terms: 20.130822139 + -0.5 = 19.630822139 x = 19.630822139 Simplifying x = 19.630822139Subproblem 2
x + 0.5 = -20.130822139 Simplifying x + 0.5 = -20.130822139 Reorder the terms: 0.5 + x = -20.130822139 Solving 0.5 + x = -20.130822139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -20.130822139 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -20.130822139 + -0.5 x = -20.130822139 + -0.5 Combine like terms: -20.130822139 + -0.5 = -20.630822139 x = -20.630822139 Simplifying x = -20.630822139Solution
The solution to the problem is based on the solutions from the subproblems. x = {19.630822139, -20.630822139}
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