y^4-12.5y^2+39.0625=0

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Solution for y^4-12.5y^2+39.0625=0 equation:


Simplifying
y4 + -12.5y2 + 39.0625 = 0

Reorder the terms:
39.0625 + -12.5y2 + y4 = 0

Solving
39.0625 + -12.5y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-39.0625' to each side of the equation.
39.0625 + -12.5y2 + -39.0625 + y4 = 0 + -39.0625

Reorder the terms:
39.0625 + -39.0625 + -12.5y2 + y4 = 0 + -39.0625

Combine like terms: 39.0625 + -39.0625 = 0.0000
0.0000 + -12.5y2 + y4 = 0 + -39.0625
-12.5y2 + y4 = 0 + -39.0625

Combine like terms: 0 + -39.0625 = -39.0625
-12.5y2 + y4 = -39.0625

The y term is -12.5y2.  Take half its coefficient (-6.25).
Square it (39.0625) and add it to both sides.

Add '39.0625' to each side of the equation.
-12.5y2 + 39.0625 + y4 = -39.0625 + 39.0625

Reorder the terms:
39.0625 + -12.5y2 + y4 = -39.0625 + 39.0625

Combine like terms: -39.0625 + 39.0625 = 0.0000
39.0625 + -12.5y2 + y4 = 0.0000

Factor a perfect square on the left side:
(y2 + -6.25)(y2 + -6.25) = 0.0000

Calculate the square root of the right side: 0.0000

Break this problem into two subproblems by setting 
(y2 + -6.25) equal to 0.0000 and 0.0000.

Subproblem 1

y2 + -6.25 = 0.0000 Simplifying y2 + -6.25 = 0.0000 Reorder the terms: -6.25 + y2 = 0.0000 Solving -6.25 + y2 = 0.0000 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + y2 = 0.0000 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + y2 = 0.0000 + 6.25 y2 = 0.0000 + 6.25 Combine like terms: 0.0000 + 6.25 = 6.25 y2 = 6.25 Simplifying y2 = 6.25 Take the square root of each side: y = {-2.5, 2.5}

Subproblem 2

y2 + -6.25 = 0.0000 Simplifying y2 + -6.25 = 0.0000 Reorder the terms: -6.25 + y2 = 0.0000 Solving -6.25 + y2 = 0.0000 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + y2 = 0.0000 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + y2 = 0.0000 + 6.25 y2 = 0.0000 + 6.25 Combine like terms: 0.0000 + 6.25 = 6.25 y2 = 6.25 Simplifying y2 = 6.25 Take the square root of each side: y = {-2.5, 2.5}

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-2.5, 2.5, -2.5, 2.5}

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