169=(3.15)r^2

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Solution for 169=(3.15)r^2 equation: 


Simplifying
169 = (3.15) * r2

Solving
169 = 3.15r2

Solving for variable 'r'.

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

Add '-3.15r2' to each side of the equation.
169 + -3.15r2 = 3.15r2 + -3.15r2

Combine like terms: 3.15r2 + -3.15r2 = 0.00
169 + -3.15r2 = 0.00

Add '-169' to each side of the equation.
169 + -169 + -3.15r2 = 0.00 + -169

Combine like terms: 169 + -169 = 0
0 + -3.15r2 = 0.00 + -169
-3.15r2 = 0.00 + -169

Combine like terms: 0.00 + -169 = -169
-3.15r2 = -169

Divide each side by '-3.15'.
r2 = 53.65079365

Simplifying
r2 = 53.65079365

Take the square root of each side:
r = {-7.324670208, 7.324670208}

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