x^4-36x^2+64=0

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Solution for x^4-36x^2+64=0 equation:


Simplifying
x4 + -36x2 + 64 = 0

Reorder the terms:
64 + -36x2 + x4 = 0

Solving
64 + -36x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-64' to each side of the equation.
64 + -36x2 + -64 + x4 = 0 + -64

Reorder the terms:
64 + -64 + -36x2 + x4 = 0 + -64

Combine like terms: 64 + -64 = 0
0 + -36x2 + x4 = 0 + -64
-36x2 + x4 = 0 + -64

Combine like terms: 0 + -64 = -64
-36x2 + x4 = -64

The x term is -36x2.  Take half its coefficient (-18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
-36x2 + 324 + x4 = -64 + 324

Reorder the terms:
324 + -36x2 + x4 = -64 + 324

Combine like terms: -64 + 324 = 260
324 + -36x2 + x4 = 260

Factor a perfect square on the left side:
(x2 + -18)(x2 + -18) = 260

Calculate the square root of the right side: 16.124515497

Break this problem into two subproblems by setting 
(x2 + -18) equal to 16.124515497 and -16.124515497.

Subproblem 1

x2 + -18 = 16.124515497 Simplifying x2 + -18 = 16.124515497 Reorder the terms: -18 + x2 = 16.124515497 Solving -18 + x2 = 16.124515497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x2 = 16.124515497 + 18 Combine like terms: -18 + 18 = 0 0 + x2 = 16.124515497 + 18 x2 = 16.124515497 + 18 Combine like terms: 16.124515497 + 18 = 34.124515497 x2 = 34.124515497 Simplifying x2 = 34.124515497 Take the square root of each side: x = {-5.841619253, 5.841619253}

Subproblem 2

x2 + -18 = -16.124515497 Simplifying x2 + -18 = -16.124515497 Reorder the terms: -18 + x2 = -16.124515497 Solving -18 + x2 = -16.124515497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x2 = -16.124515497 + 18 Combine like terms: -18 + 18 = 0 0 + x2 = -16.124515497 + 18 x2 = -16.124515497 + 18 Combine like terms: -16.124515497 + 18 = 1.875484503 x2 = 1.875484503 Simplifying x2 = 1.875484503 Take the square root of each side: x = {-1.369483298, 1.369483298}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-5.841619253, 5.841619253, -1.369483298, 1.369483298}

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