(x^2-1)(x^2-1)=9

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Solution for (x^2-1)(x^2-1)=9 equation: 


Simplifying
(x2 + -1)(x2 + -1) = 9

Reorder the terms:
(-1 + x2)(x2 + -1) = 9

Reorder the terms:
(-1 + x2)(-1 + x2) = 9

Multiply (-1 + x2) * (-1 + x2)
(-1(-1 + x2) + x2(-1 + x2)) = 9
((-1 * -1 + x2 * -1) + x2(-1 + x2)) = 9
((1 + -1x2) + x2(-1 + x2)) = 9
(1 + -1x2 + (-1 * x2 + x2 * x2)) = 9
(1 + -1x2 + (-1x2 + x4)) = 9

Combine like terms: -1x2 + -1x2 = -2x2
(1 + -2x2 + x4) = 9

Solving
1 + -2x2 + x4 = 9

Solving for variable 'x'.

Reorder the terms:
1 + -9 + -2x2 + x4 = 9 + -9

Combine like terms: 1 + -9 = -8
-8 + -2x2 + x4 = 9 + -9

Combine like terms: 9 + -9 = 0
-8 + -2x2 + x4 = 0

Factor a trinomial.
(-2 + -1x2)(4 + -1x2) = 0

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


Subproblem 1
Set the factor '(-2 + -1x2)' equal to zero and attempt to solve:

Simplifying
-2 + -1x2 = 0

Solving
-2 + -1x2 = 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 + -1x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1x2 = 0 + 2
-1x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-1x2 = 2

Divide each side by '-1'.
x2 = -2

Simplifying
x2 = -2

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 '(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 3
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}

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