9-6r^2=-135

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Solution for 9-6r^2=-135 equation: 


Simplifying
9 + -6r2 = -135

Solving
9 + -6r2 = -135

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 + -6r2 = -135 + -9

Combine like terms: 9 + -9 = 0
0 + -6r2 = -135 + -9
-6r2 = -135 + -9

Combine like terms: -135 + -9 = -144
-6r2 = -144

Divide each side by '-6'.
r2 = 24

Simplifying
r2 = 24

Take the square root of each side:
r = {-4.898979486, 4.898979486}

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