9x^4-36x^2-8=0

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Solution for 9x^4-36x^2-8=0 equation:


Simplifying
9x4 + -36x2 + -8 = 0

Reorder the terms:
-8 + -36x2 + 9x4 = 0

Solving
-8 + -36x2 + 9x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
9 the coefficient of the squared term: 

Divide each side by '9'.
-0.8888888889 + -4x2 + x4 = 0

Move the constant term to the right:

Add '0.8888888889' to each side of the equation.
-0.8888888889 + -4x2 + 0.8888888889 + x4 = 0 + 0.8888888889

Reorder the terms:
-0.8888888889 + 0.8888888889 + -4x2 + x4 = 0 + 0.8888888889

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + -4x2 + x4 = 0 + 0.8888888889
-4x2 + x4 = 0 + 0.8888888889

Combine like terms: 0 + 0.8888888889 = 0.8888888889
-4x2 + x4 = 0.8888888889

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 = 0.8888888889 + 4

Reorder the terms:
4 + -4x2 + x4 = 0.8888888889 + 4

Combine like terms: 0.8888888889 + 4 = 4.8888888889
4 + -4x2 + x4 = 4.8888888889

Factor a perfect square on the left side:
(x2 + -2)(x2 + -2) = 4.8888888889

Calculate the square root of the right side: 2.211083194

Break this problem into two subproblems by setting 
(x2 + -2) equal to 2.211083194 and -2.211083194.

Subproblem 1

x2 + -2 = 2.211083194 Simplifying x2 + -2 = 2.211083194 Reorder the terms: -2 + x2 = 2.211083194 Solving -2 + x2 = 2.211083194 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 = 2.211083194 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = 2.211083194 + 2 x2 = 2.211083194 + 2 Combine like terms: 2.211083194 + 2 = 4.211083194 x2 = 4.211083194 Simplifying x2 = 4.211083194 Take the square root of each side: x = {-2.052092394, 2.052092394}

Subproblem 2

x2 + -2 = -2.211083194 Simplifying x2 + -2 = -2.211083194 Reorder the terms: -2 + x2 = -2.211083194 Solving -2 + x2 = -2.211083194 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 = -2.211083194 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = -2.211083194 + 2 x2 = -2.211083194 + 2 Combine like terms: -2.211083194 + 2 = -0.211083194 x2 = -0.211083194 Simplifying x2 = -0.211083194 Reorder the terms: 0.211083194 + x2 = -0.211083194 + 0.211083194 Combine like terms: -0.211083194 + 0.211083194 = 0.000000000 0.211083194 + 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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