x^4=8(x^2-2)

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Solution for x^4=8(x^2-2) equation:


Simplifying
x4 = 8(x2 + -2)

Reorder the terms:
x4 = 8(-2 + x2)
x4 = (-2 * 8 + x2 * 8)
x4 = (-16 + 8x2)

Solving
x4 = -16 + 8x2

Solving for variable 'x'.

Reorder the terms:
16 + -8x2 + x4 = -16 + 8x2 + 16 + -8x2

Reorder the terms:
16 + -8x2 + x4 = -16 + 16 + 8x2 + -8x2

Combine like terms: -16 + 16 = 0
16 + -8x2 + x4 = 0 + 8x2 + -8x2
16 + -8x2 + x4 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
16 + -8x2 + x4 = 0

Factor a trinomial.
(4 + -1x2)(4 + -1x2) = 0

Factor a difference between two squares.
((2 + x)(2 + -1x))(4 + -1x2) = 0

Factor a difference between two squares.
((2 + x)(2 + -1x))(2 + x)(2 + -1x) = 0

Subproblem 1

Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Subproblem 2

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

Subproblem 3

Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Subproblem 4

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

Solution

x = {-2, 2, -2, 2}

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