x^4-8x^2-25=0

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Solution for x^4-8x^2-25=0 equation:


Simplifying
x4 + -8x2 + -25 = 0

Reorder the terms:
-25 + -8x2 + x4 = 0

Solving
-25 + -8x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -8x2 + 25 + x4 = 0 + 25

Reorder the terms:
-25 + 25 + -8x2 + x4 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -8x2 + x4 = 0 + 25
-8x2 + x4 = 0 + 25

Combine like terms: 0 + 25 = 25
-8x2 + x4 = 25

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 = 25 + 16

Reorder the terms:
16 + -8x2 + x4 = 25 + 16

Combine like terms: 25 + 16 = 41
16 + -8x2 + x4 = 41

Factor a perfect square on the left side:
(x2 + -4)(x2 + -4) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(x2 + -4) equal to 6.403124237 and -6.403124237.

Subproblem 1

x2 + -4 = 6.403124237 Simplifying x2 + -4 = 6.403124237 Reorder the terms: -4 + x2 = 6.403124237 Solving -4 + x2 = 6.403124237 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 = 6.403124237 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 6.403124237 + 4 x2 = 6.403124237 + 4 Combine like terms: 6.403124237 + 4 = 10.403124237 x2 = 10.403124237 Simplifying x2 = 10.403124237 Take the square root of each side: x = {-3.225387455, 3.225387455}

Subproblem 2

x2 + -4 = -6.403124237 Simplifying x2 + -4 = -6.403124237 Reorder the terms: -4 + x2 = -6.403124237 Solving -4 + x2 = -6.403124237 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 = -6.403124237 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -6.403124237 + 4 x2 = -6.403124237 + 4 Combine like terms: -6.403124237 + 4 = -2.403124237 x2 = -2.403124237 Simplifying x2 = -2.403124237 Reorder the terms: 2.403124237 + x2 = -2.403124237 + 2.403124237 Combine like terms: -2.403124237 + 2.403124237 = 0.000000000 2.403124237 + 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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