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Simplifying 0 = r(r) + -308.7360 Multiply r * r 0 = r2 + -308.7360 Reorder the terms: 0 = -308.7360 + r2 Solving 0 = -308.7360 + r2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r2' to each side of the equation. 0 + -1r2 = -308.7360 + r2 + -1r2 Remove the zero: -1r2 = -308.7360 + r2 + -1r2 Combine like terms: r2 + -1r2 = 0 -1r2 = -308.7360 + 0 -1r2 = -308.7360 Divide each side by '-1'. r2 = 308.736 Simplifying r2 = 308.736 Take the square root of each side: r = {-17.570885009, 17.570885009}
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