2x^4-6x^2-135=0

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Solution for 2x^4-6x^2-135=0 equation:


Simplifying
2x4 + -6x2 + -135 = 0

Reorder the terms:
-135 + -6x2 + 2x4 = 0

Solving
-135 + -6x2 + 2x4 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-67.5 + -3x2 + x4 = 0

Move the constant term to the right:

Add '67.5' to each side of the equation.
-67.5 + -3x2 + 67.5 + x4 = 0 + 67.5

Reorder the terms:
-67.5 + 67.5 + -3x2 + x4 = 0 + 67.5

Combine like terms: -67.5 + 67.5 = 0.0
0.0 + -3x2 + x4 = 0 + 67.5
-3x2 + x4 = 0 + 67.5

Combine like terms: 0 + 67.5 = 67.5
-3x2 + x4 = 67.5

The x term is -3x2.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x2 + 2.25 + x4 = 67.5 + 2.25

Reorder the terms:
2.25 + -3x2 + x4 = 67.5 + 2.25

Combine like terms: 67.5 + 2.25 = 69.75
2.25 + -3x2 + x4 = 69.75

Factor a perfect square on the left side:
(x2 + -1.5)(x2 + -1.5) = 69.75

Calculate the square root of the right side: 8.351646544

Break this problem into two subproblems by setting 
(x2 + -1.5) equal to 8.351646544 and -8.351646544.

Subproblem 1

x2 + -1.5 = 8.351646544 Simplifying x2 + -1.5 = 8.351646544 Reorder the terms: -1.5 + x2 = 8.351646544 Solving -1.5 + x2 = 8.351646544 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x2 = 8.351646544 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x2 = 8.351646544 + 1.5 x2 = 8.351646544 + 1.5 Combine like terms: 8.351646544 + 1.5 = 9.851646544 x2 = 9.851646544 Simplifying x2 = 9.851646544 Take the square root of each side: x = {-3.138733271, 3.138733271}

Subproblem 2

x2 + -1.5 = -8.351646544 Simplifying x2 + -1.5 = -8.351646544 Reorder the terms: -1.5 + x2 = -8.351646544 Solving -1.5 + x2 = -8.351646544 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x2 = -8.351646544 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x2 = -8.351646544 + 1.5 x2 = -8.351646544 + 1.5 Combine like terms: -8.351646544 + 1.5 = -6.851646544 x2 = -6.851646544 Simplifying x2 = -6.851646544 Reorder the terms: 6.851646544 + x2 = -6.851646544 + 6.851646544 Combine like terms: -6.851646544 + 6.851646544 = 0.000000000 6.851646544 + 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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