r^2-2-4=0

Solution for r^2-2-4=0 equation:

Simplifying
r2 + -2 + -4 = 0

Reorder the terms:
-2 + -4 + r2 = 0

Combine like terms: -2 + -4 = -6
-6 + r2 = 0

Solving
-6 + r2 = 0

Solving for variable 'r'.

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

Add '6' to each side of the equation.
-6 + 6 + r2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + r2 = 0 + 6
r2 = 0 + 6

Combine like terms: 0 + 6 = 6
r2 = 6

Simplifying
r2 = 6

Take the square root of each side:
r = {-2.449489743, 2.449489743}