8y^4+5-16y^2=0

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Solution for 8y^4+5-16y^2=0 equation:


Simplifying
8y4 + 5 + -16y2 = 0

Reorder the terms:
5 + -16y2 + 8y4 = 0

Solving
5 + -16y2 + 8y4 = 0

Solving for variable 'y'.

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

Divide each side by '8'.
0.625 + -2y2 + y4 = 0

Move the constant term to the right:

Add '-0.625' to each side of the equation.
0.625 + -2y2 + -0.625 + y4 = 0 + -0.625

Reorder the terms:
0.625 + -0.625 + -2y2 + y4 = 0 + -0.625

Combine like terms: 0.625 + -0.625 = 0.000
0.000 + -2y2 + y4 = 0 + -0.625
-2y2 + y4 = 0 + -0.625

Combine like terms: 0 + -0.625 = -0.625
-2y2 + y4 = -0.625

The y term is -2y2.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y2 + 1 + y4 = -0.625 + 1

Reorder the terms:
1 + -2y2 + y4 = -0.625 + 1

Combine like terms: -0.625 + 1 = 0.375
1 + -2y2 + y4 = 0.375

Factor a perfect square on the left side:
(y2 + -1)(y2 + -1) = 0.375

Calculate the square root of the right side: 0.612372436

Break this problem into two subproblems by setting 
(y2 + -1) equal to 0.612372436 and -0.612372436.

Subproblem 1

y2 + -1 = 0.612372436 Simplifying y2 + -1 = 0.612372436 Reorder the terms: -1 + y2 = 0.612372436 Solving -1 + y2 = 0.612372436 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y2 = 0.612372436 + 1 Combine like terms: -1 + 1 = 0 0 + y2 = 0.612372436 + 1 y2 = 0.612372436 + 1 Combine like terms: 0.612372436 + 1 = 1.612372436 y2 = 1.612372436 Simplifying y2 = 1.612372436 Take the square root of each side: y = {-1.269792281, 1.269792281}

Subproblem 2

y2 + -1 = -0.612372436 Simplifying y2 + -1 = -0.612372436 Reorder the terms: -1 + y2 = -0.612372436 Solving -1 + y2 = -0.612372436 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y2 = -0.612372436 + 1 Combine like terms: -1 + 1 = 0 0 + y2 = -0.612372436 + 1 y2 = -0.612372436 + 1 Combine like terms: -0.612372436 + 1 = 0.387627564 y2 = 0.387627564 Simplifying y2 = 0.387627564 Take the square root of each side: y = {-0.622597433, 0.622597433}

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.269792281, 1.269792281, -0.622597433, 0.622597433}

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