x^4-x^2-40=0

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Solution for x^4-x^2-40=0 equation:


Simplifying
x4 + -1x2 + -40 = 0

Reorder the terms:
-40 + -1x2 + x4 = 0

Solving
-40 + -1x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -1x2 + 40 + x4 = 0 + 40

Reorder the terms:
-40 + 40 + -1x2 + x4 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -1x2 + x4 = 0 + 40
-1x2 + x4 = 0 + 40

Combine like terms: 0 + 40 = 40
-1x2 + x4 = 40

The x term is -1x2.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x2 + 0.25 + x4 = 40 + 0.25

Reorder the terms:
0.25 + -1x2 + x4 = 40 + 0.25

Combine like terms: 40 + 0.25 = 40.25
0.25 + -1x2 + x4 = 40.25

Factor a perfect square on the left side:
(x2 + -0.5)(x2 + -0.5) = 40.25

Calculate the square root of the right side: 6.34428877

Break this problem into two subproblems by setting 
(x2 + -0.5) equal to 6.34428877 and -6.34428877.

Subproblem 1

x2 + -0.5 = 6.34428877 Simplifying x2 + -0.5 = 6.34428877 Reorder the terms: -0.5 + x2 = 6.34428877 Solving -0.5 + x2 = 6.34428877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x2 = 6.34428877 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x2 = 6.34428877 + 0.5 x2 = 6.34428877 + 0.5 Combine like terms: 6.34428877 + 0.5 = 6.84428877 x2 = 6.84428877 Simplifying x2 = 6.84428877 Take the square root of each side: x = {-2.616159164, 2.616159164}

Subproblem 2

x2 + -0.5 = -6.34428877 Simplifying x2 + -0.5 = -6.34428877 Reorder the terms: -0.5 + x2 = -6.34428877 Solving -0.5 + x2 = -6.34428877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x2 = -6.34428877 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x2 = -6.34428877 + 0.5 x2 = -6.34428877 + 0.5 Combine like terms: -6.34428877 + 0.5 = -5.84428877 x2 = -5.84428877 Simplifying x2 = -5.84428877 Reorder the terms: 5.84428877 + x2 = -5.84428877 + 5.84428877 Combine like terms: -5.84428877 + 5.84428877 = 0.00000000 5.84428877 + x2 = 0.00000000 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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