r^2-18-56=0

Solution for r^2-18-56=0 equation:

Simplifying
r2 + -18 + -56 = 0

Reorder the terms:
-18 + -56 + r2 = 0

Combine like terms: -18 + -56 = -74
-74 + r2 = 0

Solving
-74 + r2 = 0

Solving for variable 'r'.

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

Add '74' to each side of the equation.
-74 + 74 + r2 = 0 + 74

Combine like terms: -74 + 74 = 0
0 + r2 = 0 + 74
r2 = 0 + 74

Combine like terms: 0 + 74 = 74
r2 = 74

Simplifying
r2 = 74

Take the square root of each side:
r = {-8.602325267, 8.602325267}