3y^4-5y^2-1=0

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Solution for 3y^4-5y^2-1=0 equation:


Simplifying
3y4 + -5y2 + -1 = 0

Reorder the terms:
-1 + -5y2 + 3y4 = 0

Solving
-1 + -5y2 + 3y4 = 0

Solving for variable 'y'.

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

Divide each side by '3'.
-0.3333333333 + -1.666666667y2 + y4 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -1.666666667y2 + 0.3333333333 + y4 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -1.666666667y2 + y4 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -1.666666667y2 + y4 = 0 + 0.3333333333
-1.666666667y2 + y4 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-1.666666667y2 + y4 = 0.3333333333

The y term is -1.666666667y2.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667y2 + 0.6944444447 + y4 = 0.3333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667y2 + y4 = 0.3333333333 + 0.6944444447

Combine like terms: 0.3333333333 + 0.6944444447 = 1.027777778
0.6944444447 + -1.666666667y2 + y4 = 1.027777778

Factor a perfect square on the left side:
(y2 + -0.8333333335)(y2 + -0.8333333335) = 1.027777778

Calculate the square root of the right side: 1.013793755

Break this problem into two subproblems by setting 
(y2 + -0.8333333335) equal to 1.013793755 and -1.013793755.

Subproblem 1

y2 + -0.8333333335 = 1.013793755 Simplifying y2 + -0.8333333335 = 1.013793755 Reorder the terms: -0.8333333335 + y2 = 1.013793755 Solving -0.8333333335 + y2 = 1.013793755 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + y2 = 1.013793755 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + y2 = 1.013793755 + 0.8333333335 y2 = 1.013793755 + 0.8333333335 Combine like terms: 1.013793755 + 0.8333333335 = 1.8471270885 y2 = 1.8471270885 Simplifying y2 = 1.8471270885 Take the square root of each side: y = {-1.359090537, 1.359090537}

Subproblem 2

y2 + -0.8333333335 = -1.013793755 Simplifying y2 + -0.8333333335 = -1.013793755 Reorder the terms: -0.8333333335 + y2 = -1.013793755 Solving -0.8333333335 + y2 = -1.013793755 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + y2 = -1.013793755 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + y2 = -1.013793755 + 0.8333333335 y2 = -1.013793755 + 0.8333333335 Combine like terms: -1.013793755 + 0.8333333335 = -0.1804604215 y2 = -0.1804604215 Simplifying y2 = -0.1804604215 Reorder the terms: 0.1804604215 + y2 = -0.1804604215 + 0.1804604215 Combine like terms: -0.1804604215 + 0.1804604215 = 0.0000000000 0.1804604215 + y2 = 0.0000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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