x^4-10x^2-8=0

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Solution for x^4-10x^2-8=0 equation:


Simplifying
x4 + -10x2 + -8 = 0

Reorder the terms:
-8 + -10x2 + x4 = 0

Solving
-8 + -10x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -10x2 + 8 + x4 = 0 + 8

Reorder the terms:
-8 + 8 + -10x2 + x4 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -10x2 + x4 = 0 + 8
-10x2 + x4 = 0 + 8

Combine like terms: 0 + 8 = 8
-10x2 + x4 = 8

The x term is -10x2.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x2 + 25 + x4 = 8 + 25

Reorder the terms:
25 + -10x2 + x4 = 8 + 25

Combine like terms: 8 + 25 = 33
25 + -10x2 + x4 = 33

Factor a perfect square on the left side:
(x2 + -5)(x2 + -5) = 33

Calculate the square root of the right side: 5.744562647

Break this problem into two subproblems by setting 
(x2 + -5) equal to 5.744562647 and -5.744562647.

Subproblem 1

x2 + -5 = 5.744562647 Simplifying x2 + -5 = 5.744562647 Reorder the terms: -5 + x2 = 5.744562647 Solving -5 + x2 = 5.744562647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x2 = 5.744562647 + 5 Combine like terms: -5 + 5 = 0 0 + x2 = 5.744562647 + 5 x2 = 5.744562647 + 5 Combine like terms: 5.744562647 + 5 = 10.744562647 x2 = 10.744562647 Simplifying x2 = 10.744562647 Take the square root of each side: x = {-3.277889969, 3.277889969}

Subproblem 2

x2 + -5 = -5.744562647 Simplifying x2 + -5 = -5.744562647 Reorder the terms: -5 + x2 = -5.744562647 Solving -5 + x2 = -5.744562647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x2 = -5.744562647 + 5 Combine like terms: -5 + 5 = 0 0 + x2 = -5.744562647 + 5 x2 = -5.744562647 + 5 Combine like terms: -5.744562647 + 5 = -0.744562647 x2 = -0.744562647 Simplifying x2 = -0.744562647 Reorder the terms: 0.744562647 + x2 = -0.744562647 + 0.744562647 Combine like terms: -0.744562647 + 0.744562647 = 0.000000000 0.744562647 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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