x^4-26x^2=25

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Solution for x^4-26x^2=25 equation:


Simplifying
x4 + -26x2 = 25

Reorder the terms:
-26x2 + x4 = 25

Solving
-26x2 + x4 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + -26x2 + x4 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + -26x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -26x2 + 25 + x4 = 0 + 25

Reorder the terms:
-25 + 25 + -26x2 + x4 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -26x2 + x4 = 0 + 25
-26x2 + x4 = 0 + 25

Combine like terms: 0 + 25 = 25
-26x2 + x4 = 25

The x term is -26x2.  Take half its coefficient (-13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
-26x2 + 169 + x4 = 25 + 169

Reorder the terms:
169 + -26x2 + x4 = 25 + 169

Combine like terms: 25 + 169 = 194
169 + -26x2 + x4 = 194

Factor a perfect square on the left side:
(x2 + -13)(x2 + -13) = 194

Calculate the square root of the right side: 13.928388277

Break this problem into two subproblems by setting 
(x2 + -13) equal to 13.928388277 and -13.928388277.

Subproblem 1

x2 + -13 = 13.928388277 Simplifying x2 + -13 = 13.928388277 Reorder the terms: -13 + x2 = 13.928388277 Solving -13 + x2 = 13.928388277 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x2 = 13.928388277 + 13 Combine like terms: -13 + 13 = 0 0 + x2 = 13.928388277 + 13 x2 = 13.928388277 + 13 Combine like terms: 13.928388277 + 13 = 26.928388277 x2 = 26.928388277 Simplifying x2 = 26.928388277 Take the square root of each side: x = {-5.189257006, 5.189257006}

Subproblem 2

x2 + -13 = -13.928388277 Simplifying x2 + -13 = -13.928388277 Reorder the terms: -13 + x2 = -13.928388277 Solving -13 + x2 = -13.928388277 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x2 = -13.928388277 + 13 Combine like terms: -13 + 13 = 0 0 + x2 = -13.928388277 + 13 x2 = -13.928388277 + 13 Combine like terms: -13.928388277 + 13 = -0.928388277 x2 = -0.928388277 Simplifying x2 = -0.928388277 Reorder the terms: 0.928388277 + x2 = -0.928388277 + 0.928388277 Combine like terms: -0.928388277 + 0.928388277 = 0.000000000 0.928388277 + 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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