y^4-33y^2+256=0

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Solution for y^4-33y^2+256=0 equation:


Simplifying
y4 + -33y2 + 256 = 0

Reorder the terms:
256 + -33y2 + y4 = 0

Solving
256 + -33y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-256' to each side of the equation.
256 + -33y2 + -256 + y4 = 0 + -256

Reorder the terms:
256 + -256 + -33y2 + y4 = 0 + -256

Combine like terms: 256 + -256 = 0
0 + -33y2 + y4 = 0 + -256
-33y2 + y4 = 0 + -256

Combine like terms: 0 + -256 = -256
-33y2 + y4 = -256

The y term is -33y2.  Take half its coefficient (-16.5).
Square it (272.25) and add it to both sides.

Add '272.25' to each side of the equation.
-33y2 + 272.25 + y4 = -256 + 272.25

Reorder the terms:
272.25 + -33y2 + y4 = -256 + 272.25

Combine like terms: -256 + 272.25 = 16.25
272.25 + -33y2 + y4 = 16.25

Factor a perfect square on the left side:
(y2 + -16.5)(y2 + -16.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(y2 + -16.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

y2 + -16.5 = 4.031128874 Simplifying y2 + -16.5 = 4.031128874 Reorder the terms: -16.5 + y2 = 4.031128874 Solving -16.5 + y2 = 4.031128874 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '16.5' to each side of the equation. -16.5 + 16.5 + y2 = 4.031128874 + 16.5 Combine like terms: -16.5 + 16.5 = 0.0 0.0 + y2 = 4.031128874 + 16.5 y2 = 4.031128874 + 16.5 Combine like terms: 4.031128874 + 16.5 = 20.531128874 y2 = 20.531128874 Simplifying y2 = 20.531128874 Take the square root of each side: y = {-4.531128874, 4.531128874}

Subproblem 2

y2 + -16.5 = -4.031128874 Simplifying y2 + -16.5 = -4.031128874 Reorder the terms: -16.5 + y2 = -4.031128874 Solving -16.5 + y2 = -4.031128874 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '16.5' to each side of the equation. -16.5 + 16.5 + y2 = -4.031128874 + 16.5 Combine like terms: -16.5 + 16.5 = 0.0 0.0 + y2 = -4.031128874 + 16.5 y2 = -4.031128874 + 16.5 Combine like terms: -4.031128874 + 16.5 = 12.468871126 y2 = 12.468871126 Simplifying y2 = 12.468871126 Take the square root of each side: y = {-3.531128874, 3.531128874}

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-4.531128874, 4.531128874, -3.531128874, 3.531128874}

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