20r^2-5=

Solution for 20r^2-5= equation:

Simplifying
20r2 + -5 = 0

Reorder the terms:
-5 + 20r2 = 0

Solving
-5 + 20r2 = 0

Solving for variable 'r'.

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

Add '5' to each side of the equation.
-5 + 5 + 20r2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 20r2 = 0 + 5
20r2 = 0 + 5

Combine like terms: 0 + 5 = 5
20r2 = 5

Divide each side by '20'.
r2 = 0.25

Simplifying
r2 = 0.25

Take the square root of each side:
r = {-0.5, 0.5}