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Simplifying 0 = r(r) + -19.36 Multiply r * r 0 = r2 + -19.36 Reorder the terms: 0 = -19.36 + r2 Solving 0 = -19.36 + 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 = -19.36 + r2 + -1r2 Remove the zero: -1r2 = -19.36 + r2 + -1r2 Combine like terms: r2 + -1r2 = 0 -1r2 = -19.36 + 0 -1r2 = -19.36 Divide each side by '-1'. r2 = 19.36 Simplifying r2 = 19.36 Take the square root of each side: r = {-4.4, 4.4}
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