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Simplifying x2 + 4x + 2.2 = 0 Reorder the terms: 2.2 + 4x + x2 = 0 Solving 2.2 + 4x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-2.2' to each side of the equation. 2.2 + 4x + -2.2 + x2 = 0 + -2.2 Reorder the terms: 2.2 + -2.2 + 4x + x2 = 0 + -2.2 Combine like terms: 2.2 + -2.2 = 0.0 0.0 + 4x + x2 = 0 + -2.2 4x + x2 = 0 + -2.2 Combine like terms: 0 + -2.2 = -2.2 4x + x2 = -2.2 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = -2.2 + 4 Reorder the terms: 4 + 4x + x2 = -2.2 + 4 Combine like terms: -2.2 + 4 = 1.8 4 + 4x + x2 = 1.8 Factor a perfect square on the left side: (x + 2)(x + 2) = 1.8 Calculate the square root of the right side: 1.341640787 Break this problem into two subproblems by setting (x + 2) equal to 1.341640787 and -1.341640787.Subproblem 1
x + 2 = 1.341640787 Simplifying x + 2 = 1.341640787 Reorder the terms: 2 + x = 1.341640787 Solving 2 + x = 1.341640787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 1.341640787 + -2 Combine like terms: 2 + -2 = 0 0 + x = 1.341640787 + -2 x = 1.341640787 + -2 Combine like terms: 1.341640787 + -2 = -0.658359213 x = -0.658359213 Simplifying x = -0.658359213Subproblem 2
x + 2 = -1.341640787 Simplifying x + 2 = -1.341640787 Reorder the terms: 2 + x = -1.341640787 Solving 2 + x = -1.341640787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -1.341640787 + -2 Combine like terms: 2 + -2 = 0 0 + x = -1.341640787 + -2 x = -1.341640787 + -2 Combine like terms: -1.341640787 + -2 = -3.341640787 x = -3.341640787 Simplifying x = -3.341640787Solution
The solution to the problem is based on the solutions from the subproblems. x = {-0.658359213, -3.341640787}
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