x^4+64x^2-729=0

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Solution for x^4+64x^2-729=0 equation:


Simplifying
x4 + 64x2 + -729 = 0

Reorder the terms:
-729 + 64x2 + x4 = 0

Solving
-729 + 64x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '729' to each side of the equation.
-729 + 64x2 + 729 + x4 = 0 + 729

Reorder the terms:
-729 + 729 + 64x2 + x4 = 0 + 729

Combine like terms: -729 + 729 = 0
0 + 64x2 + x4 = 0 + 729
64x2 + x4 = 0 + 729

Combine like terms: 0 + 729 = 729
64x2 + x4 = 729

The x term is 64x2.  Take half its coefficient (32).
Square it (1024) and add it to both sides.

Add '1024' to each side of the equation.
64x2 + 1024 + x4 = 729 + 1024

Reorder the terms:
1024 + 64x2 + x4 = 729 + 1024

Combine like terms: 729 + 1024 = 1753
1024 + 64x2 + x4 = 1753

Factor a perfect square on the left side:
(x2 + 32)(x2 + 32) = 1753

Calculate the square root of the right side: 41.868842831

Break this problem into two subproblems by setting 
(x2 + 32) equal to 41.868842831 and -41.868842831.

Subproblem 1

x2 + 32 = 41.868842831 Simplifying x2 + 32 = 41.868842831 Reorder the terms: 32 + x2 = 41.868842831 Solving 32 + x2 = 41.868842831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-32' to each side of the equation. 32 + -32 + x2 = 41.868842831 + -32 Combine like terms: 32 + -32 = 0 0 + x2 = 41.868842831 + -32 x2 = 41.868842831 + -32 Combine like terms: 41.868842831 + -32 = 9.868842831 x2 = 9.868842831 Simplifying x2 = 9.868842831 Take the square root of each side: x = {-3.141471444, 3.141471444}

Subproblem 2

x2 + 32 = -41.868842831 Simplifying x2 + 32 = -41.868842831 Reorder the terms: 32 + x2 = -41.868842831 Solving 32 + x2 = -41.868842831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-32' to each side of the equation. 32 + -32 + x2 = -41.868842831 + -32 Combine like terms: 32 + -32 = 0 0 + x2 = -41.868842831 + -32 x2 = -41.868842831 + -32 Combine like terms: -41.868842831 + -32 = -73.868842831 x2 = -73.868842831 Simplifying x2 = -73.868842831 Reorder the terms: 73.868842831 + x2 = -73.868842831 + 73.868842831 Combine like terms: -73.868842831 + 73.868842831 = 0.000000000 73.868842831 + 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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