8r^2-7=65

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Solution for 8r^2-7=65 equation: 


Simplifying
8r2 + -7 = 65

Reorder the terms:
-7 + 8r2 = 65

Solving
-7 + 8r2 = 65

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + 8r2 = 65 + 7

Combine like terms: -7 + 7 = 0
0 + 8r2 = 65 + 7
8r2 = 65 + 7

Combine like terms: 65 + 7 = 72
8r2 = 72

Divide each side by '8'.
r2 = 9

Simplifying
r2 = 9

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

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