2x^4-9x^2+1=0

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Solution for 2x^4-9x^2+1=0 equation:


Simplifying
2x4 + -9x2 + 1 = 0

Reorder the terms:
1 + -9x2 + 2x4 = 0

Solving
1 + -9x2 + 2x4 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
0.5 + -4.5x2 + x4 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -4.5x2 + -0.5 + x4 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -4.5x2 + x4 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -4.5x2 + x4 = 0 + -0.5
-4.5x2 + x4 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-4.5x2 + x4 = -0.5

The x term is -4.5x2.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x2 + 5.0625 + x4 = -0.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x2 + x4 = -0.5 + 5.0625

Combine like terms: -0.5 + 5.0625 = 4.5625
5.0625 + -4.5x2 + x4 = 4.5625

Factor a perfect square on the left side:
(x2 + -2.25)(x2 + -2.25) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(x2 + -2.25) equal to 2.136000936 and -2.136000936.

Subproblem 1

x2 + -2.25 = 2.136000936 Simplifying x2 + -2.25 = 2.136000936 Reorder the terms: -2.25 + x2 = 2.136000936 Solving -2.25 + x2 = 2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x2 = 2.136000936 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x2 = 2.136000936 + 2.25 x2 = 2.136000936 + 2.25 Combine like terms: 2.136000936 + 2.25 = 4.386000936 x2 = 4.386000936 Simplifying x2 = 4.386000936 Take the square root of each side: x = {-2.094278142, 2.094278142}

Subproblem 2

x2 + -2.25 = -2.136000936 Simplifying x2 + -2.25 = -2.136000936 Reorder the terms: -2.25 + x2 = -2.136000936 Solving -2.25 + x2 = -2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x2 = -2.136000936 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x2 = -2.136000936 + 2.25 x2 = -2.136000936 + 2.25 Combine like terms: -2.136000936 + 2.25 = 0.113999064 x2 = 0.113999064 Simplifying x2 = 0.113999064 Take the square root of each side: x = {-0.337637474, 0.337637474}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.094278142, 2.094278142, -0.337637474, 0.337637474}

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