8-9r^2=-415

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Solution for 8-9r^2=-415 equation: 


Simplifying
8 + -9r2 = -415

Solving
8 + -9r2 = -415

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + -9r2 = -415 + -8

Combine like terms: 8 + -8 = 0
0 + -9r2 = -415 + -8
-9r2 = -415 + -8

Combine like terms: -415 + -8 = -423
-9r2 = -423

Divide each side by '-9'.
r2 = 47

Simplifying
r2 = 47

Take the square root of each side:
r = {-6.8556546, 6.8556546}

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