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Simplifying
19 + 169r2 = 380
Solving
19 + 169r2 = 380
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-19' to each side of the equation.
19 + -19 + 169r2 = 380 + -19
Combine like terms: 19 + -19 = 0
0 + 169r2 = 380 + -19
169r2 = 380 + -19
Combine like terms: 380 + -19 = 361
169r2 = 361
Divide each side by '169'.
r2 = 2.136094675
Simplifying
r2 = 2.136094675
Take the square root of each side:
r = {-1.461538462, 1.461538462}
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