x^4-9x^2-2=0

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Solution for x^4-9x^2-2=0 equation: 


Simplifying
x4 + -9x2 + -2 = 0

Reorder the terms:
-2 + -9x2 + x4 = 0

Solving
-2 + -9x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -9x2 + 2 + x4 = 0 + 2

Reorder the terms:
-2 + 2 + -9x2 + x4 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -9x2 + x4 = 0 + 2
-9x2 + x4 = 0 + 2

Combine like terms: 0 + 2 = 2
-9x2 + x4 = 2

The x term is -9x2.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x2 + 20.25 + x4 = 2 + 20.25

Reorder the terms:
20.25 + -9x2 + x4 = 2 + 20.25

Combine like terms: 2 + 20.25 = 22.25
20.25 + -9x2 + x4 = 22.25

Factor a perfect square on the left side:
(x2 + -4.5)(x2 + -4.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(x2 + -4.5) equal to 4.716990566 and -4.716990566.


Subproblem 1
x2 + -4.5 = 4.716990566

Simplifying
x2 + -4.5 = 4.716990566

Reorder the terms:
-4.5 + x2 = 4.716990566

Solving
-4.5 + x2 = 4.716990566

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '4.5' to each side of the equation.
-4.5 + 4.5 + x2 = 4.716990566 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + x2 = 4.716990566 + 4.5
x2 = 4.716990566 + 4.5

Combine like terms: 4.716990566 + 4.5 = 9.216990566
x2 = 9.216990566

Simplifying
x2 = 9.216990566

Take the square root of each side:
x = {-3.035949698, 3.035949698}


Subproblem 2
x2 + -4.5 = -4.716990566

Simplifying
x2 + -4.5 = -4.716990566

Reorder the terms:
-4.5 + x2 = -4.716990566

Solving
-4.5 + x2 = -4.716990566

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '4.5' to each side of the equation.
-4.5 + 4.5 + x2 = -4.716990566 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + x2 = -4.716990566 + 4.5
x2 = -4.716990566 + 4.5

Combine like terms: -4.716990566 + 4.5 = -0.216990566
x2 = -0.216990566

Simplifying
x2 = -0.216990566

Reorder the terms:
0.216990566 + x2 = -0.216990566 + 0.216990566

Combine like terms: -0.216990566 + 0.216990566 = 0.000000000
0.216990566 + 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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