4=x^2-1

Solution for 4=x^2-1 equation:

Simplifying
4 = x2 + -1

Reorder the terms:
4 = -1 + x2

Solving
4 = -1 + x2

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '-1'.
x2 = 5

Simplifying
x2 = 5

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