(x^2-4)(x^2+4)=(8x^2-7)

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Solution for (x^2-4)(x^2+4)=(8x^2-7) equation:


Simplifying
(x2 + -4)(x2 + 4) = (8x2 + -7)

Reorder the terms:
(-4 + x2)(x2 + 4) = (8x2 + -7)

Reorder the terms:
(-4 + x2)(4 + x2) = (8x2 + -7)

Multiply (-4 + x2) * (4 + x2)
(-4(4 + x2) + x2(4 + x2)) = (8x2 + -7)
((4 * -4 + x2 * -4) + x2(4 + x2)) = (8x2 + -7)
((-16 + -4x2) + x2(4 + x2)) = (8x2 + -7)
(-16 + -4x2 + (4 * x2 + x2 * x2)) = (8x2 + -7)
(-16 + -4x2 + (4x2 + x4)) = (8x2 + -7)

Combine like terms: -4x2 + 4x2 = 0
(-16 + 0 + x4) = (8x2 + -7)
(-16 + x4) = (8x2 + -7)

Reorder the terms:
-16 + x4 = (-7 + 8x2)

Remove parenthesis around (-7 + 8x2)
-16 + x4 = -7 + 8x2

Solving
-16 + x4 = -7 + 8x2

Solving for variable 'x'.

Reorder the terms:
-16 + 7 + -8x2 + x4 = -7 + 8x2 + 7 + -8x2

Combine like terms: -16 + 7 = -9
-9 + -8x2 + x4 = -7 + 8x2 + 7 + -8x2

Reorder the terms:
-9 + -8x2 + x4 = -7 + 7 + 8x2 + -8x2

Combine like terms: -7 + 7 = 0
-9 + -8x2 + x4 = 0 + 8x2 + -8x2
-9 + -8x2 + x4 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
-9 + -8x2 + x4 = 0

Factor a trinomial.
(-1 + -1x2)(9 + -1x2) = 0

Factor a difference between two squares.
(-1 + -1x2)((3 + x)(3 + -1x)) = 0

Subproblem 1

Set the factor '(-1 + -1x2)' equal to zero and attempt to solve: Simplifying -1 + -1x2 = 0 Solving -1 + -1x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -1x2 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1x2 = 0 + 1 -1x2 = 0 + 1 Combine like terms: 0 + 1 = 1 -1x2 = 1 Divide each side by '-1'. x2 = -1 Simplifying x2 = -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 '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Subproblem 3

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {-3, 3}

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