x^4-3x^2-27=0

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Solution for x^4-3x^2-27=0 equation:


Simplifying
x4 + -3x2 + -27 = 0

Reorder the terms:
-27 + -3x2 + x4 = 0

Solving
-27 + -3x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + -3x2 + 27 + x4 = 0 + 27

Reorder the terms:
-27 + 27 + -3x2 + x4 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + -3x2 + x4 = 0 + 27
-3x2 + x4 = 0 + 27

Combine like terms: 0 + 27 = 27
-3x2 + x4 = 27

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 = 27 + 2.25

Reorder the terms:
2.25 + -3x2 + x4 = 27 + 2.25

Combine like terms: 27 + 2.25 = 29.25
2.25 + -3x2 + x4 = 29.25

Factor a perfect square on the left side:
(x2 + -1.5)(x2 + -1.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(x2 + -1.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

x2 + -1.5 = 5.408326913 Simplifying x2 + -1.5 = 5.408326913 Reorder the terms: -1.5 + x2 = 5.408326913 Solving -1.5 + x2 = 5.408326913 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 = 5.408326913 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x2 = 5.408326913 + 1.5 x2 = 5.408326913 + 1.5 Combine like terms: 5.408326913 + 1.5 = 6.908326913 x2 = 6.908326913 Simplifying x2 = 6.908326913 Take the square root of each side: x = {-2.62836963, 2.62836963}

Subproblem 2

x2 + -1.5 = -5.408326913 Simplifying x2 + -1.5 = -5.408326913 Reorder the terms: -1.5 + x2 = -5.408326913 Solving -1.5 + x2 = -5.408326913 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 = -5.408326913 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x2 = -5.408326913 + 1.5 x2 = -5.408326913 + 1.5 Combine like terms: -5.408326913 + 1.5 = -3.908326913 x2 = -3.908326913 Simplifying x2 = -3.908326913 Reorder the terms: 3.908326913 + x2 = -3.908326913 + 3.908326913 Combine like terms: -3.908326913 + 3.908326913 = 0.000000000 3.908326913 + 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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