(x+1)(x-1)=4

Solution for (x+1)(x-1)=4 equation:

Simplifying
(x + 1)(x + -1) = 4

Reorder the terms:
(1 + x)(x + -1) = 4

Reorder the terms:
(1 + x)(-1 + x) = 4

Multiply (1 + x) * (-1 + x)
(1(-1 + x) + x(-1 + x)) = 4
((-1 * 1 + x * 1) + x(-1 + x)) = 4
((-1 + 1x) + x(-1 + x)) = 4
(-1 + 1x + (-1 * x + x * x)) = 4
(-1 + 1x + (-1x + x2)) = 4

Combine like terms: 1x + -1x = 0
(-1 + 0 + x2) = 4
(-1 + x2) = 4

Solving
-1 + x2 = 4

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + 1 + x2 = 4 + 1

Combine like terms: -1 + 1 = 0
0 + x2 = 4 + 1
x2 = 4 + 1

Combine like terms: 4 + 1 = 5
x2 = 5

Simplifying
x2 = 5

Take the square root of each side:
x = {-2.236067978, 2.236067978}