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Simplifying 0 = 5x2 + -5x + -8 Reorder the terms: 0 = -8 + -5x + 5x2 Solving 0 = -8 + -5x + 5x2 Solving for variable 'x'. Combine like terms: 0 + 8 = 8 8 + 5x + -5x2 = -8 + -5x + 5x2 + 8 + 5x + -5x2 Reorder the terms: 8 + 5x + -5x2 = -8 + 8 + -5x + 5x + 5x2 + -5x2 Combine like terms: -8 + 8 = 0 8 + 5x + -5x2 = 0 + -5x + 5x + 5x2 + -5x2 8 + 5x + -5x2 = -5x + 5x + 5x2 + -5x2 Combine like terms: -5x + 5x = 0 8 + 5x + -5x2 = 0 + 5x2 + -5x2 8 + 5x + -5x2 = 5x2 + -5x2 Combine like terms: 5x2 + -5x2 = 0 8 + 5x + -5x2 = 0 Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. -1.6 + -1x + x2 = 0 Move the constant term to the right: Add '1.6' to each side of the equation. -1.6 + -1x + 1.6 + x2 = 0 + 1.6 Reorder the terms: -1.6 + 1.6 + -1x + x2 = 0 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + -1x + x2 = 0 + 1.6 -1x + x2 = 0 + 1.6 Combine like terms: 0 + 1.6 = 1.6 -1x + x2 = 1.6 The x term is -1x. 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 = 1.6 + 0.25 Reorder the terms: 0.25 + -1x + x2 = 1.6 + 0.25 Combine like terms: 1.6 + 0.25 = 1.85 0.25 + -1x + x2 = 1.85 Factor a perfect square on the left side: (x + -0.5)(x + -0.5) = 1.85 Calculate the square root of the right side: 1.360147051 Break this problem into two subproblems by setting (x + -0.5) equal to 1.360147051 and -1.360147051.Subproblem 1
x + -0.5 = 1.360147051 Simplifying x + -0.5 = 1.360147051 Reorder the terms: -0.5 + x = 1.360147051 Solving -0.5 + x = 1.360147051 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 = 1.360147051 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 1.360147051 + 0.5 x = 1.360147051 + 0.5 Combine like terms: 1.360147051 + 0.5 = 1.860147051 x = 1.860147051 Simplifying x = 1.860147051Subproblem 2
x + -0.5 = -1.360147051 Simplifying x + -0.5 = -1.360147051 Reorder the terms: -0.5 + x = -1.360147051 Solving -0.5 + x = -1.360147051 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 = -1.360147051 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -1.360147051 + 0.5 x = -1.360147051 + 0.5 Combine like terms: -1.360147051 + 0.5 = -0.860147051 x = -0.860147051 Simplifying x = -0.860147051Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.860147051, -0.860147051}
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