x^4-5x^2-25=0

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Solution for x^4-5x^2-25=0 equation:


Simplifying
x4 + -5x2 + -25 = 0

Reorder the terms:
-25 + -5x2 + x4 = 0

Solving
-25 + -5x2 + 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 + -5x2 + 25 + x4 = 0 + 25

Reorder the terms:
-25 + 25 + -5x2 + x4 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -5x2 + x4 = 0 + 25
-5x2 + x4 = 0 + 25

Combine like terms: 0 + 25 = 25
-5x2 + x4 = 25

The x term is -5x2.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x2 + 6.25 + x4 = 25 + 6.25

Reorder the terms:
6.25 + -5x2 + x4 = 25 + 6.25

Combine like terms: 25 + 6.25 = 31.25
6.25 + -5x2 + x4 = 31.25

Factor a perfect square on the left side:
(x2 + -2.5)(x2 + -2.5) = 31.25

Calculate the square root of the right side: 5.590169944

Break this problem into two subproblems by setting 
(x2 + -2.5) equal to 5.590169944 and -5.590169944.

Subproblem 1

x2 + -2.5 = 5.590169944 Simplifying x2 + -2.5 = 5.590169944 Reorder the terms: -2.5 + x2 = 5.590169944 Solving -2.5 + x2 = 5.590169944 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x2 = 5.590169944 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x2 = 5.590169944 + 2.5 x2 = 5.590169944 + 2.5 Combine like terms: 5.590169944 + 2.5 = 8.090169944 x2 = 8.090169944 Simplifying x2 = 8.090169944 Take the square root of each side: x = {-2.844322405, 2.844322405}

Subproblem 2

x2 + -2.5 = -5.590169944 Simplifying x2 + -2.5 = -5.590169944 Reorder the terms: -2.5 + x2 = -5.590169944 Solving -2.5 + x2 = -5.590169944 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x2 = -5.590169944 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x2 = -5.590169944 + 2.5 x2 = -5.590169944 + 2.5 Combine like terms: -5.590169944 + 2.5 = -3.090169944 x2 = -3.090169944 Simplifying x2 = -3.090169944 Reorder the terms: 3.090169944 + x2 = -3.090169944 + 3.090169944 Combine like terms: -3.090169944 + 3.090169944 = 0.000000000 3.090169944 + 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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