4r^2-36=0

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Solution for 4r^2-36=0 equation: 


Simplifying
4r2 + -36 = 0

Reorder the terms:
-36 + 4r2 = 0

Solving
-36 + 4r2 = 0

Solving for variable 'r'.

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

Add '36' to each side of the equation.
-36 + 36 + 4r2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 4r2 = 0 + 36
4r2 = 0 + 36

Combine like terms: 0 + 36 = 36
4r2 = 36

Divide each side by '4'.
r2 = 9

Simplifying
r2 = 9

Take the square root of each side:
r = {-3, 3}

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