x^4-8x^2=1440

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Solution for x^4-8x^2=1440 equation:


Simplifying
x4 + -8x2 = 1440

Reorder the terms:
-8x2 + x4 = 1440

Solving
-8x2 + x4 = 1440

Solving for variable 'x'.

Reorder the terms:
-1440 + -8x2 + x4 = 1440 + -1440

Combine like terms: 1440 + -1440 = 0
-1440 + -8x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '1440' to each side of the equation.
-1440 + -8x2 + 1440 + x4 = 0 + 1440

Reorder the terms:
-1440 + 1440 + -8x2 + x4 = 0 + 1440

Combine like terms: -1440 + 1440 = 0
0 + -8x2 + x4 = 0 + 1440
-8x2 + x4 = 0 + 1440

Combine like terms: 0 + 1440 = 1440
-8x2 + x4 = 1440

The x term is -8x2.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x2 + 16 + x4 = 1440 + 16

Reorder the terms:
16 + -8x2 + x4 = 1440 + 16

Combine like terms: 1440 + 16 = 1456
16 + -8x2 + x4 = 1456

Factor a perfect square on the left side:
(x2 + -4)(x2 + -4) = 1456

Calculate the square root of the right side: 38.157568057

Break this problem into two subproblems by setting 
(x2 + -4) equal to 38.157568057 and -38.157568057.

Subproblem 1

x2 + -4 = 38.157568057 Simplifying x2 + -4 = 38.157568057 Reorder the terms: -4 + x2 = 38.157568057 Solving -4 + x2 = 38.157568057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = 38.157568057 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 38.157568057 + 4 x2 = 38.157568057 + 4 Combine like terms: 38.157568057 + 4 = 42.157568057 x2 = 42.157568057 Simplifying x2 = 42.157568057 Take the square root of each side: x = {-6.492885957, 6.492885957}

Subproblem 2

x2 + -4 = -38.157568057 Simplifying x2 + -4 = -38.157568057 Reorder the terms: -4 + x2 = -38.157568057 Solving -4 + x2 = -38.157568057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = -38.157568057 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -38.157568057 + 4 x2 = -38.157568057 + 4 Combine like terms: -38.157568057 + 4 = -34.157568057 x2 = -34.157568057 Simplifying x2 = -34.157568057 Reorder the terms: 34.157568057 + x2 = -34.157568057 + 34.157568057 Combine like terms: -34.157568057 + 34.157568057 = 0.000000000 34.157568057 + 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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