4r(r)-100=0

Solution for 4r(r)-100=0 equation:

Simplifying
4r(r) + -100 = 0

Multiply r * r
4r2 + -100 = 0

Reorder the terms:
-100 + 4r2 = 0

Solving
-100 + 4r2 = 0

Solving for variable 'r'.

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

Add '100' to each side of the equation.
-100 + 100 + 4r2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 4r2 = 0 + 100
4r2 = 0 + 100

Combine like terms: 0 + 100 = 100
4r2 = 100

Divide each side by '4'.
r2 = 25

Simplifying
r2 = 25

Take the square root of each side:
r = {-5, 5}