3r^2-20=7

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Solution for 3r^2-20=7 equation: 


Simplifying
3r2 + -20 = 7

Reorder the terms:
-20 + 3r2 = 7

Solving
-20 + 3r2 = 7

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 + 3r2 = 7 + 20

Combine like terms: -20 + 20 = 0
0 + 3r2 = 7 + 20
3r2 = 7 + 20

Combine like terms: 7 + 20 = 27
3r2 = 27

Divide each side by '3'.
r2 = 9

Simplifying
r2 = 9

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

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