5r^2-20=

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Solution for 5r^2-20= equation: 


Simplifying
5r2 + -20 = 0

Reorder the terms:
-20 + 5r2 = 0

Solving
-20 + 5r2 = 0

Solving for variable 'r'.

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

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

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

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

Divide each side by '5'.
r2 = 4

Simplifying
r2 = 4

Take the square root of each side:
r = {-2, 2}

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