x^4+x^2-720=0

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Solution for x^4+x^2-720=0 equation:


Simplifying
x4 + x2 + -720 = 0

Reorder the terms:
-720 + x2 + x4 = 0

Solving
-720 + x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '720' to each side of the equation.
-720 + x2 + 720 + x4 = 0 + 720

Reorder the terms:
-720 + 720 + x2 + x4 = 0 + 720

Combine like terms: -720 + 720 = 0
0 + x2 + x4 = 0 + 720
x2 + x4 = 0 + 720

Combine like terms: 0 + 720 = 720
x2 + x4 = 720

The x term is x2.  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.
x2 + 0.25 + x4 = 720 + 0.25

Reorder the terms:
0.25 + x2 + x4 = 720 + 0.25

Combine like terms: 720 + 0.25 = 720.25
0.25 + x2 + x4 = 720.25

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 720.25

Calculate the square root of the right side: 26.837473801

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 26.837473801 and -26.837473801.

Subproblem 1

x2 + 0.5 = 26.837473801 Simplifying x2 + 0.5 = 26.837473801 Reorder the terms: 0.5 + x2 = 26.837473801 Solving 0.5 + x2 = 26.837473801 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 = 26.837473801 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 26.837473801 + -0.5 x2 = 26.837473801 + -0.5 Combine like terms: 26.837473801 + -0.5 = 26.337473801 x2 = 26.337473801 Simplifying x2 = 26.337473801 Take the square root of each side: x = {-5.132004852, 5.132004852}

Subproblem 2

x2 + 0.5 = -26.837473801 Simplifying x2 + 0.5 = -26.837473801 Reorder the terms: 0.5 + x2 = -26.837473801 Solving 0.5 + x2 = -26.837473801 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 = -26.837473801 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -26.837473801 + -0.5 x2 = -26.837473801 + -0.5 Combine like terms: -26.837473801 + -0.5 = -27.337473801 x2 = -27.337473801 Simplifying x2 = -27.337473801 Reorder the terms: 27.337473801 + x2 = -27.337473801 + 27.337473801 Combine like terms: -27.337473801 + 27.337473801 = 0.000000000 27.337473801 + 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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