x^4+4x^2-36=0

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Solution for x^4+4x^2-36=0 equation:


Simplifying
x4 + 4x2 + -36 = 0

Reorder the terms:
-36 + 4x2 + x4 = 0

Solving
-36 + 4x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 4x2 + 36 + x4 = 0 + 36

Reorder the terms:
-36 + 36 + 4x2 + x4 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 4x2 + x4 = 0 + 36
4x2 + x4 = 0 + 36

Combine like terms: 0 + 36 = 36
4x2 + x4 = 36

The x term is 4x2.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x2 + 4 + x4 = 36 + 4

Reorder the terms:
4 + 4x2 + x4 = 36 + 4

Combine like terms: 36 + 4 = 40
4 + 4x2 + x4 = 40

Factor a perfect square on the left side:
(x2 + 2)(x2 + 2) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x2 + 2) equal to 6.32455532 and -6.32455532.

Subproblem 1

x2 + 2 = 6.32455532 Simplifying x2 + 2 = 6.32455532 Reorder the terms: 2 + x2 = 6.32455532 Solving 2 + x2 = 6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x2 = 6.32455532 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = 6.32455532 + -2 x2 = 6.32455532 + -2 Combine like terms: 6.32455532 + -2 = 4.32455532 x2 = 4.32455532 Simplifying x2 = 4.32455532 Take the square root of each side: x = {-2.07955652, 2.07955652}

Subproblem 2

x2 + 2 = -6.32455532 Simplifying x2 + 2 = -6.32455532 Reorder the terms: 2 + x2 = -6.32455532 Solving 2 + x2 = -6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x2 = -6.32455532 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = -6.32455532 + -2 x2 = -6.32455532 + -2 Combine like terms: -6.32455532 + -2 = -8.32455532 x2 = -8.32455532 Simplifying x2 = -8.32455532 Reorder the terms: 8.32455532 + x2 = -8.32455532 + 8.32455532 Combine like terms: -8.32455532 + 8.32455532 = 0.00000000 8.32455532 + 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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