9r^2-5=76

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Solution for 9r^2-5=76 equation: 


Simplifying
9r2 + -5 = 76

Reorder the terms:
-5 + 9r2 = 76

Solving
-5 + 9r2 = 76

Solving for variable 'r'.

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

Add '5' to each side of the equation.
-5 + 5 + 9r2 = 76 + 5

Combine like terms: -5 + 5 = 0
0 + 9r2 = 76 + 5
9r2 = 76 + 5

Combine like terms: 76 + 5 = 81
9r2 = 81

Divide each side by '9'.
r2 = 9

Simplifying
r2 = 9

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

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