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Simplifying 0.4x2 + -1.1x + -2 = 0 Reorder the terms: -2 + -1.1x + 0.4x2 = 0 Solving -2 + -1.1x + 0.4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 0.4 the coefficient of the squared term: Divide each side by '0.4'. -5 + -2.75x + x2 = 0 Move the constant term to the right: Add '5' to each side of the equation. -5 + -2.75x + 5 + x2 = 0 + 5 Reorder the terms: -5 + 5 + -2.75x + x2 = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2.75x + x2 = 0 + 5 -2.75x + x2 = 0 + 5 Combine like terms: 0 + 5 = 5 -2.75x + x2 = 5 The x term is -2.75x. Take half its coefficient (-1.375). Square it (1.890625) and add it to both sides. Add '1.890625' to each side of the equation. -2.75x + 1.890625 + x2 = 5 + 1.890625 Reorder the terms: 1.890625 + -2.75x + x2 = 5 + 1.890625 Combine like terms: 5 + 1.890625 = 6.890625 1.890625 + -2.75x + x2 = 6.890625 Factor a perfect square on the left side: (x + -1.375)(x + -1.375) = 6.890625 Calculate the square root of the right side: 2.625 Break this problem into two subproblems by setting (x + -1.375) equal to 2.625 and -2.625.Subproblem 1
x + -1.375 = 2.625 Simplifying x + -1.375 = 2.625 Reorder the terms: -1.375 + x = 2.625 Solving -1.375 + x = 2.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = 2.625 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 2.625 + 1.375 x = 2.625 + 1.375 Combine like terms: 2.625 + 1.375 = 4 x = 4 Simplifying x = 4Subproblem 2
x + -1.375 = -2.625 Simplifying x + -1.375 = -2.625 Reorder the terms: -1.375 + x = -2.625 Solving -1.375 + x = -2.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = -2.625 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -2.625 + 1.375 x = -2.625 + 1.375 Combine like terms: -2.625 + 1.375 = -1.25 x = -1.25 Simplifying x = -1.25Solution
The solution to the problem is based on the solutions from the subproblems. x = {4, -1.25}
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