4y^4+8y^2-9=0

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Solution for 4y^4+8y^2-9=0 equation:


Simplifying
4y4 + 8y2 + -9 = 0

Reorder the terms:
-9 + 8y2 + 4y4 = 0

Solving
-9 + 8y2 + 4y4 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
-2.25 + 2y2 + y4 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + 2y2 + 2.25 + y4 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + 2y2 + y4 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + 2y2 + y4 = 0 + 2.25
2y2 + y4 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
2y2 + y4 = 2.25

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 = 2.25 + 1

Reorder the terms:
1 + 2y2 + y4 = 2.25 + 1

Combine like terms: 2.25 + 1 = 3.25
1 + 2y2 + y4 = 3.25

Factor a perfect square on the left side:
(y2 + 1)(y2 + 1) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(y2 + 1) equal to 1.802775638 and -1.802775638.

Subproblem 1

y2 + 1 = 1.802775638 Simplifying y2 + 1 = 1.802775638 Reorder the terms: 1 + y2 = 1.802775638 Solving 1 + y2 = 1.802775638 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 = 1.802775638 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = 1.802775638 + -1 y2 = 1.802775638 + -1 Combine like terms: 1.802775638 + -1 = 0.802775638 y2 = 0.802775638 Simplifying y2 = 0.802775638 Take the square root of each side: y = {-0.895977476, 0.895977476}

Subproblem 2

y2 + 1 = -1.802775638 Simplifying y2 + 1 = -1.802775638 Reorder the terms: 1 + y2 = -1.802775638 Solving 1 + y2 = -1.802775638 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 = -1.802775638 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = -1.802775638 + -1 y2 = -1.802775638 + -1 Combine like terms: -1.802775638 + -1 = -2.802775638 y2 = -2.802775638 Simplifying y2 = -2.802775638 Reorder the terms: 2.802775638 + y2 = -2.802775638 + 2.802775638 Combine like terms: -2.802775638 + 2.802775638 = 0.000000000 2.802775638 + y2 = 0.000000000 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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