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

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


Simplifying
y4 + -4y2 + 4 = 0

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

Solving
4 + -4y2 + y4 = 0

Solving for variable 'y'.

Factor a trinomial.
(2 + -1y2)(2 + -1y2) = 0

Subproblem 1

Set the factor '(2 + -1y2)' equal to zero and attempt to solve: Simplifying 2 + -1y2 = 0 Solving 2 + -1y2 = 0 Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1y2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1y2 = 0 + -2 -1y2 = 0 + -2 Combine like terms: 0 + -2 = -2 -1y2 = -2 Divide each side by '-1'. y2 = 2 Simplifying y2 = 2 Take the square root of each side: y = {-1.414213562, 1.414213562}

Subproblem 2

Set the factor '(2 + -1y2)' equal to zero and attempt to solve: Simplifying 2 + -1y2 = 0 Solving 2 + -1y2 = 0 Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1y2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1y2 = 0 + -2 -1y2 = 0 + -2 Combine like terms: 0 + -2 = -2 -1y2 = -2 Divide each side by '-1'. y2 = 2 Simplifying y2 = 2 Take the square root of each side: y = {-1.414213562, 1.414213562}

Solution

y = {-1.414213562, 1.414213562, -1.414213562, 1.414213562}

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