-9-3r^2=-69

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Solution for -9-3r^2=-69 equation: 


Simplifying
-9 + -3r2 = -69

Solving
-9 + -3r2 = -69

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + -3r2 = -69 + 9

Combine like terms: -9 + 9 = 0
0 + -3r2 = -69 + 9
-3r2 = -69 + 9

Combine like terms: -69 + 9 = -60
-3r2 = -60

Divide each side by '-3'.
r2 = 20

Simplifying
r2 = 20

Take the square root of each side:
r = {-4.472135955, 4.472135955}

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