5x^4-8x^2+1=0

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Solution for 5x^4-8x^2+1=0 equation:


Simplifying
5x4 + -8x2 + 1 = 0

Reorder the terms:
1 + -8x2 + 5x4 = 0

Solving
1 + -8x2 + 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'.
0.2 + -1.6x2 + x4 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + -1.6x2 + -0.2 + x4 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + -1.6x2 + x4 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + -1.6x2 + x4 = 0 + -0.2
-1.6x2 + x4 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
-1.6x2 + x4 = -0.2

The x term is -1.6x2.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x2 + 0.64 + x4 = -0.2 + 0.64

Reorder the terms:
0.64 + -1.6x2 + x4 = -0.2 + 0.64

Combine like terms: -0.2 + 0.64 = 0.44
0.64 + -1.6x2 + x4 = 0.44

Factor a perfect square on the left side:
(x2 + -0.8)(x2 + -0.8) = 0.44

Calculate the square root of the right side: 0.663324958

Break this problem into two subproblems by setting 
(x2 + -0.8) equal to 0.663324958 and -0.663324958.

Subproblem 1

x2 + -0.8 = 0.663324958 Simplifying x2 + -0.8 = 0.663324958 Reorder the terms: -0.8 + x2 = 0.663324958 Solving -0.8 + x2 = 0.663324958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x2 = 0.663324958 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x2 = 0.663324958 + 0.8 x2 = 0.663324958 + 0.8 Combine like terms: 0.663324958 + 0.8 = 1.463324958 x2 = 1.463324958 Simplifying x2 = 1.463324958 Take the square root of each side: x = {-1.209679692, 1.209679692}

Subproblem 2

x2 + -0.8 = -0.663324958 Simplifying x2 + -0.8 = -0.663324958 Reorder the terms: -0.8 + x2 = -0.663324958 Solving -0.8 + x2 = -0.663324958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x2 = -0.663324958 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x2 = -0.663324958 + 0.8 x2 = -0.663324958 + 0.8 Combine like terms: -0.663324958 + 0.8 = 0.136675042 x2 = 0.136675042 Simplifying x2 = 0.136675042 Take the square root of each side: x = {-0.369695878, 0.369695878}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.209679692, 1.209679692, -0.369695878, 0.369695878}

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