x^4+8x^2-36=0

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Solution for x^4+8x^2-36=0 equation:


Simplifying
x4 + 8x2 + -36 = 0

Reorder the terms:
-36 + 8x2 + x4 = 0

Solving
-36 + 8x2 + 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 + 8x2 + 36 + x4 = 0 + 36

Reorder the terms:
-36 + 36 + 8x2 + x4 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 8x2 + x4 = 0 + 36
8x2 + x4 = 0 + 36

Combine like terms: 0 + 36 = 36
8x2 + x4 = 36

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 = 36 + 16

Reorder the terms:
16 + 8x2 + x4 = 36 + 16

Combine like terms: 36 + 16 = 52
16 + 8x2 + x4 = 52

Factor a perfect square on the left side:
(x2 + 4)(x2 + 4) = 52

Calculate the square root of the right side: 7.211102551

Break this problem into two subproblems by setting 
(x2 + 4) equal to 7.211102551 and -7.211102551.

Subproblem 1

x2 + 4 = 7.211102551 Simplifying x2 + 4 = 7.211102551 Reorder the terms: 4 + x2 = 7.211102551 Solving 4 + x2 = 7.211102551 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 = 7.211102551 + -4 Combine like terms: 4 + -4 = 0 0 + x2 = 7.211102551 + -4 x2 = 7.211102551 + -4 Combine like terms: 7.211102551 + -4 = 3.211102551 x2 = 3.211102551 Simplifying x2 = 3.211102551 Take the square root of each side: x = {-1.791954952, 1.791954952}

Subproblem 2

x2 + 4 = -7.211102551 Simplifying x2 + 4 = -7.211102551 Reorder the terms: 4 + x2 = -7.211102551 Solving 4 + x2 = -7.211102551 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 = -7.211102551 + -4 Combine like terms: 4 + -4 = 0 0 + x2 = -7.211102551 + -4 x2 = -7.211102551 + -4 Combine like terms: -7.211102551 + -4 = -11.211102551 x2 = -11.211102551 Simplifying x2 = -11.211102551 Reorder the terms: 11.211102551 + x2 = -11.211102551 + 11.211102551 Combine like terms: -11.211102551 + 11.211102551 = 0.000000000 11.211102551 + 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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