8r^2-40-112=0

Solution for 8r^2-40-112=0 equation:

Simplifying
8r2 + -40 + -112 = 0

Reorder the terms:
-40 + -112 + 8r2 = 0

Combine like terms: -40 + -112 = -152
-152 + 8r2 = 0

Solving
-152 + 8r2 = 0

Solving for variable 'r'.

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

Add '152' to each side of the equation.
-152 + 152 + 8r2 = 0 + 152

Combine like terms: -152 + 152 = 0
0 + 8r2 = 0 + 152
8r2 = 0 + 152

Combine like terms: 0 + 152 = 152
8r2 = 152

Divide each side by '8'.
r2 = 19

Simplifying
r2 = 19

Take the square root of each side:
r = {-4.358898944, 4.358898944}