x^4-8x^2-64=0

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Solution for x^4-8x^2-64=0 equation:


Simplifying
x4 + -8x2 + -64 = 0

Reorder the terms:
-64 + -8x2 + x4 = 0

Solving
-64 + -8x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -8x2 + 64 + x4 = 0 + 64

Reorder the terms:
-64 + 64 + -8x2 + x4 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -8x2 + x4 = 0 + 64
-8x2 + x4 = 0 + 64

Combine like terms: 0 + 64 = 64
-8x2 + x4 = 64

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 = 64 + 16

Reorder the terms:
16 + -8x2 + x4 = 64 + 16

Combine like terms: 64 + 16 = 80
16 + -8x2 + x4 = 80

Factor a perfect square on the left side:
(x2 + -4)(x2 + -4) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(x2 + -4) equal to 8.94427191 and -8.94427191.

Subproblem 1

x2 + -4 = 8.94427191 Simplifying x2 + -4 = 8.94427191 Reorder the terms: -4 + x2 = 8.94427191 Solving -4 + x2 = 8.94427191 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 = 8.94427191 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 8.94427191 + 4 x2 = 8.94427191 + 4 Combine like terms: 8.94427191 + 4 = 12.94427191 x2 = 12.94427191 Simplifying x2 = 12.94427191 Take the square root of each side: x = {-3.59781488, 3.59781488}

Subproblem 2

x2 + -4 = -8.94427191 Simplifying x2 + -4 = -8.94427191 Reorder the terms: -4 + x2 = -8.94427191 Solving -4 + x2 = -8.94427191 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 = -8.94427191 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -8.94427191 + 4 x2 = -8.94427191 + 4 Combine like terms: -8.94427191 + 4 = -4.94427191 x2 = -4.94427191 Simplifying x2 = -4.94427191 Reorder the terms: 4.94427191 + x2 = -4.94427191 + 4.94427191 Combine like terms: -4.94427191 + 4.94427191 = 0.00000000 4.94427191 + x2 = 0.00000000 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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