y^4-9y^2-162=0

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Solution for y^4-9y^2-162=0 equation:


Simplifying
y4 + -9y2 + -162 = 0

Reorder the terms:
-162 + -9y2 + y4 = 0

Solving
-162 + -9y2 + y4 = 0

Solving for variable 'y'.

Factor a trinomial.
(-9 + -1y2)(18 + -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 '(18 + -1y2)' equal to zero and attempt to solve: Simplifying 18 + -1y2 = 0 Solving 18 + -1y2 = 0 Move all terms containing y to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -1y2 = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -1y2 = 0 + -18 -1y2 = 0 + -18 Combine like terms: 0 + -18 = -18 -1y2 = -18 Divide each side by '-1'. y2 = 18 Simplifying y2 = 18 Take the square root of each side: y = {-4.242640687, 4.242640687}

Solution

y = {-4.242640687, 4.242640687}

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