y^4+y^2-72=0

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Solution for y^4+y^2-72=0 equation:


Simplifying
y4 + y2 + -72 = 0

Reorder the terms:
-72 + y2 + y4 = 0

Solving
-72 + y2 + y4 = 0

Solving for variable 'y'.

Factor a trinomial.
(-9 + -1y2)(8 + -1y2) = 0

Subproblem 1

Set the factor '(-9 + -1y2)' equal to zero and attempt to solve: Simplifying -9 + -1y2 = 0 Solving -9 + -1y2 = 0 Move all terms containing y to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1y2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1y2 = 0 + 9 -1y2 = 0 + 9 Combine like terms: 0 + 9 = 9 -1y2 = 9 Divide each side by '-1'. y2 = -9 Simplifying y2 = -9 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(8 + -1y2)' equal to zero and attempt to solve: Simplifying 8 + -1y2 = 0 Solving 8 + -1y2 = 0 Move all terms containing y to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1y2 = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1y2 = 0 + -8 -1y2 = 0 + -8 Combine like terms: 0 + -8 = -8 -1y2 = -8 Divide each side by '-1'. y2 = 8 Simplifying y2 = 8 Take the square root of each side: y = {-2.828427125, 2.828427125}

Solution

y = {-2.828427125, 2.828427125}

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