5x^4-180x^2+1296=0

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Solution for 5x^4-180x^2+1296=0 equation:


Simplifying
5x4 + -180x2 + 1296 = 0

Reorder the terms:
1296 + -180x2 + 5x4 = 0

Solving
1296 + -180x2 + 5x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
259.2 + -36x2 + x4 = 0

Move the constant term to the right:

Add '-259.2' to each side of the equation.
259.2 + -36x2 + -259.2 + x4 = 0 + -259.2

Reorder the terms:
259.2 + -259.2 + -36x2 + x4 = 0 + -259.2

Combine like terms: 259.2 + -259.2 = 0.0
0.0 + -36x2 + x4 = 0 + -259.2
-36x2 + x4 = 0 + -259.2

Combine like terms: 0 + -259.2 = -259.2
-36x2 + x4 = -259.2

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 = -259.2 + 324

Reorder the terms:
324 + -36x2 + x4 = -259.2 + 324

Combine like terms: -259.2 + 324 = 64.8
324 + -36x2 + x4 = 64.8

Factor a perfect square on the left side:
(x2 + -18)(x2 + -18) = 64.8

Calculate the square root of the right side: 8.049844719

Break this problem into two subproblems by setting 
(x2 + -18) equal to 8.049844719 and -8.049844719.

Subproblem 1

x2 + -18 = 8.049844719 Simplifying x2 + -18 = 8.049844719 Reorder the terms: -18 + x2 = 8.049844719 Solving -18 + x2 = 8.049844719 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 = 8.049844719 + 18 Combine like terms: -18 + 18 = 0 0 + x2 = 8.049844719 + 18 x2 = 8.049844719 + 18 Combine like terms: 8.049844719 + 18 = 26.049844719 x2 = 26.049844719 Simplifying x2 = 26.049844719 Take the square root of each side: x = {-5.10390485, 5.10390485}

Subproblem 2

x2 + -18 = -8.049844719 Simplifying x2 + -18 = -8.049844719 Reorder the terms: -18 + x2 = -8.049844719 Solving -18 + x2 = -8.049844719 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 = -8.049844719 + 18 Combine like terms: -18 + 18 = 0 0 + x2 = -8.049844719 + 18 x2 = -8.049844719 + 18 Combine like terms: -8.049844719 + 18 = 9.950155281 x2 = 9.950155281 Simplifying x2 = 9.950155281 Take the square root of each side: x = {-3.154386673, 3.154386673}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-5.10390485, 5.10390485, -3.154386673, 3.154386673}

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