w^4-15w^2-16=0

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Solution for w^4-15w^2-16=0 equation:


Simplifying
w4 + -15w2 + -16 = 0

Reorder the terms:
-16 + -15w2 + w4 = 0

Solving
-16 + -15w2 + w4 = 0

Solving for variable 'w'.

Factor a trinomial.
(-1 + -1w2)(16 + -1w2) = 0

Factor a difference between two squares.
(-1 + -1w2)((4 + w)(4 + -1w)) = 0

Subproblem 1

Set the factor '(-1 + -1w2)' equal to zero and attempt to solve: Simplifying -1 + -1w2 = 0 Solving -1 + -1w2 = 0 Move all terms containing w to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -1w2 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1w2 = 0 + 1 -1w2 = 0 + 1 Combine like terms: 0 + 1 = 1 -1w2 = 1 Divide each side by '-1'. w2 = -1 Simplifying w2 = -1 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 '(4 + w)' equal to zero and attempt to solve: Simplifying 4 + w = 0 Solving 4 + w = 0 Move all terms containing w to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + w = 0 + -4 Combine like terms: 4 + -4 = 0 0 + w = 0 + -4 w = 0 + -4 Combine like terms: 0 + -4 = -4 w = -4 Simplifying w = -4

Subproblem 3

Set the factor '(4 + -1w)' equal to zero and attempt to solve: Simplifying 4 + -1w = 0 Solving 4 + -1w = 0 Move all terms containing w to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1w = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1w = 0 + -4 -1w = 0 + -4 Combine like terms: 0 + -4 = -4 -1w = -4 Divide each side by '-1'. w = 4 Simplifying w = 4

Solution

w = {-4, 4}

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