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Simplifying x4 + -8x2 + 5 = 0 Reorder the terms: 5 + -8x2 + x4 = 0 Solving 5 + -8x2 + x4 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-5' to each side of the equation. 5 + -8x2 + -5 + x4 = 0 + -5 Reorder the terms: 5 + -5 + -8x2 + x4 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -8x2 + x4 = 0 + -5 -8x2 + x4 = 0 + -5 Combine like terms: 0 + -5 = -5 -8x2 + x4 = -5 The x term is -8x2. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8x2 + 16 + x4 = -5 + 16 Reorder the terms: 16 + -8x2 + x4 = -5 + 16 Combine like terms: -5 + 16 = 11 16 + -8x2 + x4 = 11 Factor a perfect square on the left side: (x2 + -4)(x2 + -4) = 11 Calculate the square root of the right side: 3.31662479 Break this problem into two subproblems by setting (x2 + -4) equal to 3.31662479 and -3.31662479.Subproblem 1
x2 + -4 = 3.31662479 Simplifying x2 + -4 = 3.31662479 Reorder the terms: -4 + x2 = 3.31662479 Solving -4 + x2 = 3.31662479 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = 3.31662479 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 3.31662479 + 4 x2 = 3.31662479 + 4 Combine like terms: 3.31662479 + 4 = 7.31662479 x2 = 7.31662479 Simplifying x2 = 7.31662479 Take the square root of each side: x = {-2.704926023, 2.704926023}Subproblem 2
x2 + -4 = -3.31662479 Simplifying x2 + -4 = -3.31662479 Reorder the terms: -4 + x2 = -3.31662479 Solving -4 + x2 = -3.31662479 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = -3.31662479 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -3.31662479 + 4 x2 = -3.31662479 + 4 Combine like terms: -3.31662479 + 4 = 0.68337521 x2 = 0.68337521 Simplifying x2 = 0.68337521 Take the square root of each side: x = {-0.826665114, 0.826665114}Solution
The solution to the problem is based on the solutions from the subproblems. x = {-2.704926023, 2.704926023, -0.826665114, 0.826665114}
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