9r^2+4=328

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Solution for 9r^2+4=328 equation: 


Simplifying
9r2 + 4 = 328

Reorder the terms:
4 + 9r2 = 328

Solving
4 + 9r2 = 328

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + 9r2 = 328 + -4

Combine like terms: 4 + -4 = 0
0 + 9r2 = 328 + -4
9r2 = 328 + -4

Combine like terms: 328 + -4 = 324
9r2 = 324

Divide each side by '9'.
r2 = 36

Simplifying
r2 = 36

Take the square root of each side:
r = {-6, 6}

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