0=9x^4-160x^2+232

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Solution for 0=9x^4-160x^2+232 equation:


Simplifying
0 = 9x4 + -160x2 + 232

Reorder the terms:
0 = 232 + -160x2 + 9x4

Solving
0 = 232 + -160x2 + 9x4

Solving for variable 'x'.

Combine like terms: 0 + -232 = -232
-232 + 160x2 + -9x4 = 232 + -160x2 + 9x4 + -232 + 160x2 + -9x4

Reorder the terms:
-232 + 160x2 + -9x4 = 232 + -232 + -160x2 + 160x2 + 9x4 + -9x4

Combine like terms: 232 + -232 = 0
-232 + 160x2 + -9x4 = 0 + -160x2 + 160x2 + 9x4 + -9x4
-232 + 160x2 + -9x4 = -160x2 + 160x2 + 9x4 + -9x4

Combine like terms: -160x2 + 160x2 = 0
-232 + 160x2 + -9x4 = 0 + 9x4 + -9x4
-232 + 160x2 + -9x4 = 9x4 + -9x4

Combine like terms: 9x4 + -9x4 = 0
-232 + 160x2 + -9x4 = 0

Begin completing the square.  Divide all terms by
-9 the coefficient of the squared term: 

Divide each side by '-9'.
25.77777778 + -17.77777778x2 + x4 = 0

Move the constant term to the right:

Add '-25.77777778' to each side of the equation.
25.77777778 + -17.77777778x2 + -25.77777778 + x4 = 0 + -25.77777778

Reorder the terms:
25.77777778 + -25.77777778 + -17.77777778x2 + x4 = 0 + -25.77777778

Combine like terms: 25.77777778 + -25.77777778 = 0.00000000
0.00000000 + -17.77777778x2 + x4 = 0 + -25.77777778
-17.77777778x2 + x4 = 0 + -25.77777778

Combine like terms: 0 + -25.77777778 = -25.77777778
-17.77777778x2 + x4 = -25.77777778

The x term is -17.77777778x2.  Take half its coefficient (-8.88888889).
Square it (79.01234570) and add it to both sides.

Add '79.01234570' to each side of the equation.
-17.77777778x2 + 79.01234570 + x4 = -25.77777778 + 79.01234570

Reorder the terms:
79.01234570 + -17.77777778x2 + x4 = -25.77777778 + 79.01234570

Combine like terms: -25.77777778 + 79.01234570 = 53.23456792
79.01234570 + -17.77777778x2 + x4 = 53.23456792

Factor a perfect square on the left side:
(x2 + -8.88888889)(x2 + -8.88888889) = 53.23456792

Calculate the square root of the right side: 7.296202294

Break this problem into two subproblems by setting 
(x2 + -8.88888889) equal to 7.296202294 and -7.296202294.

Subproblem 1

x2 + -8.88888889 = 7.296202294 Simplifying x2 + -8.88888889 = 7.296202294 Reorder the terms: -8.88888889 + x2 = 7.296202294 Solving -8.88888889 + x2 = 7.296202294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.88888889' to each side of the equation. -8.88888889 + 8.88888889 + x2 = 7.296202294 + 8.88888889 Combine like terms: -8.88888889 + 8.88888889 = 0.00000000 0.00000000 + x2 = 7.296202294 + 8.88888889 x2 = 7.296202294 + 8.88888889 Combine like terms: 7.296202294 + 8.88888889 = 16.185091184 x2 = 16.185091184 Simplifying x2 = 16.185091184 Take the square root of each side: x = {-4.023069871, 4.023069871}

Subproblem 2

x2 + -8.88888889 = -7.296202294 Simplifying x2 + -8.88888889 = -7.296202294 Reorder the terms: -8.88888889 + x2 = -7.296202294 Solving -8.88888889 + x2 = -7.296202294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.88888889' to each side of the equation. -8.88888889 + 8.88888889 + x2 = -7.296202294 + 8.88888889 Combine like terms: -8.88888889 + 8.88888889 = 0.00000000 0.00000000 + x2 = -7.296202294 + 8.88888889 x2 = -7.296202294 + 8.88888889 Combine like terms: -7.296202294 + 8.88888889 = 1.592686596 x2 = 1.592686596 Simplifying x2 = 1.592686596 Take the square root of each side: x = {-1.262016876, 1.262016876}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.023069871, 4.023069871, -1.262016876, 1.262016876}

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