x^4-8x^2+2=0

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Solution for x^4-8x^2+2=0 equation:


Simplifying
x4 + -8x2 + 2 = 0

Reorder the terms:
2 + -8x2 + x4 = 0

Solving
2 + -8x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -8x2 + -2 + x4 = 0 + -2

Reorder the terms:
2 + -2 + -8x2 + x4 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -8x2 + x4 = 0 + -2
-8x2 + x4 = 0 + -2

Combine like terms: 0 + -2 = -2
-8x2 + x4 = -2

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 = -2 + 16

Reorder the terms:
16 + -8x2 + x4 = -2 + 16

Combine like terms: -2 + 16 = 14
16 + -8x2 + x4 = 14

Factor a perfect square on the left side:
(x2 + -4)(x2 + -4) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(x2 + -4) equal to 3.741657387 and -3.741657387.

Subproblem 1

x2 + -4 = 3.741657387 Simplifying x2 + -4 = 3.741657387 Reorder the terms: -4 + x2 = 3.741657387 Solving -4 + x2 = 3.741657387 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 = 3.741657387 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 3.741657387 + 4 x2 = 3.741657387 + 4 Combine like terms: 3.741657387 + 4 = 7.741657387 x2 = 7.741657387 Simplifying x2 = 7.741657387 Take the square root of each side: x = {-2.7823834, 2.7823834}

Subproblem 2

x2 + -4 = -3.741657387 Simplifying x2 + -4 = -3.741657387 Reorder the terms: -4 + x2 = -3.741657387 Solving -4 + x2 = -3.741657387 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 = -3.741657387 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -3.741657387 + 4 x2 = -3.741657387 + 4 Combine like terms: -3.741657387 + 4 = 0.258342613 x2 = 0.258342613 Simplifying x2 = 0.258342613 Take the square root of each side: x = {-0.508274151, 0.508274151}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.7823834, 2.7823834, -0.508274151, 0.508274151}

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