x^4-18x^2-36=0

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Solution for x^4-18x^2-36=0 equation:


Simplifying
x4 + -18x2 + -36 = 0

Reorder the terms:
-36 + -18x2 + x4 = 0

Solving
-36 + -18x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -18x2 + 36 + x4 = 0 + 36

Reorder the terms:
-36 + 36 + -18x2 + x4 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -18x2 + x4 = 0 + 36
-18x2 + x4 = 0 + 36

Combine like terms: 0 + 36 = 36
-18x2 + x4 = 36

The x term is -18x2.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x2 + 81 + x4 = 36 + 81

Reorder the terms:
81 + -18x2 + x4 = 36 + 81

Combine like terms: 36 + 81 = 117
81 + -18x2 + x4 = 117

Factor a perfect square on the left side:
(x2 + -9)(x2 + -9) = 117

Calculate the square root of the right side: 10.816653826

Break this problem into two subproblems by setting 
(x2 + -9) equal to 10.816653826 and -10.816653826.

Subproblem 1

x2 + -9 = 10.816653826 Simplifying x2 + -9 = 10.816653826 Reorder the terms: -9 + x2 = 10.816653826 Solving -9 + x2 = 10.816653826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x2 = 10.816653826 + 9 Combine like terms: -9 + 9 = 0 0 + x2 = 10.816653826 + 9 x2 = 10.816653826 + 9 Combine like terms: 10.816653826 + 9 = 19.816653826 x2 = 19.816653826 Simplifying x2 = 19.816653826 Take the square root of each side: x = {-4.451590033, 4.451590033}

Subproblem 2

x2 + -9 = -10.816653826 Simplifying x2 + -9 = -10.816653826 Reorder the terms: -9 + x2 = -10.816653826 Solving -9 + x2 = -10.816653826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x2 = -10.816653826 + 9 Combine like terms: -9 + 9 = 0 0 + x2 = -10.816653826 + 9 x2 = -10.816653826 + 9 Combine like terms: -10.816653826 + 9 = -1.816653826 x2 = -1.816653826 Simplifying x2 = -1.816653826 Reorder the terms: 1.816653826 + x2 = -1.816653826 + 1.816653826 Combine like terms: -1.816653826 + 1.816653826 = 0.000000000 1.816653826 + 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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