y^4+5y^2-84=0

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Solution for y^4+5y^2-84=0 equation:


Simplifying
y4 + 5y2 + -84 = 0

Reorder the terms:
-84 + 5y2 + y4 = 0

Solving
-84 + 5y2 + y4 = 0

Solving for variable 'y'.

Factor a trinomial.
(-12 + -1y2)(7 + -1y2) = 0

Subproblem 1

Set the factor '(-12 + -1y2)' equal to zero and attempt to solve: Simplifying -12 + -1y2 = 0 Solving -12 + -1y2 = 0 Move all terms containing y to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -1y2 = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -1y2 = 0 + 12 -1y2 = 0 + 12 Combine like terms: 0 + 12 = 12 -1y2 = 12 Divide each side by '-1'. y2 = -12 Simplifying y2 = -12 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 '(7 + -1y2)' equal to zero and attempt to solve: Simplifying 7 + -1y2 = 0 Solving 7 + -1y2 = 0 Move all terms containing y to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1y2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1y2 = 0 + -7 -1y2 = 0 + -7 Combine like terms: 0 + -7 = -7 -1y2 = -7 Divide each side by '-1'. y2 = 7 Simplifying y2 = 7 Take the square root of each side: y = {-2.645751311, 2.645751311}

Solution

y = {-2.645751311, 2.645751311}

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