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Simplifying 0.2x2 + -0.2x + -0.4 = 0 Reorder the terms: -0.4 + -0.2x + 0.2x2 = 0 Solving -0.4 + -0.2x + 0.2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 0.2 the coefficient of the squared term: Divide each side by '0.2'. -2 + -1x + x2 = 0 Move the constant term to the right: Add '2' to each side of the equation. -2 + -1x + 2 + x2 = 0 + 2 Reorder the terms: -2 + 2 + -1x + x2 = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x + x2 = 0 + 2 -1x + x2 = 0 + 2 Combine like terms: 0 + 2 = 2 -1x + x2 = 2 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 = 2 + 0.25 Reorder the terms: 0.25 + -1x + x2 = 2 + 0.25 Combine like terms: 2 + 0.25 = 2.25 0.25 + -1x + x2 = 2.25 Factor a perfect square on the left side: (x + -0.5)(x + -0.5) = 2.25 Calculate the square root of the right side: 1.5 Break this problem into two subproblems by setting (x + -0.5) equal to 1.5 and -1.5.Subproblem 1
x + -0.5 = 1.5 Simplifying x + -0.5 = 1.5 Reorder the terms: -0.5 + x = 1.5 Solving -0.5 + x = 1.5 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 = 1.5 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 1.5 + 0.5 x = 1.5 + 0.5 Combine like terms: 1.5 + 0.5 = 2 x = 2 Simplifying x = 2Subproblem 2
x + -0.5 = -1.5 Simplifying x + -0.5 = -1.5 Reorder the terms: -0.5 + x = -1.5 Solving -0.5 + x = -1.5 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 = -1.5 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -1.5 + 0.5 x = -1.5 + 0.5 Combine like terms: -1.5 + 0.5 = -1 x = -1 Simplifying x = -1Solution
The solution to the problem is based on the solutions from the subproblems. x = {2, -1}
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