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Simplifying
3r2 + -18 = -6
Reorder the terms:
-18 + 3r2 = -6
Solving
-18 + 3r2 = -6
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '18' to each side of the equation.
-18 + 18 + 3r2 = -6 + 18
Combine like terms: -18 + 18 = 0
0 + 3r2 = -6 + 18
3r2 = -6 + 18
Combine like terms: -6 + 18 = 12
3r2 = 12
Divide each side by '3'.
r2 = 4
Simplifying
r2 = 4
Take the square root of each side:
r = {-2, 2}
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