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Vertical asymptotes of a rational function occur for x values which make the denominator zero, if any. So to find them we will find the solutions to: if any.
Since this is a quadratic equation we can either factor it or use the Quadratic Formula. It factors pretty easily:
According to the Zero Product Property this product can be zero only if one (or more) factors is zero. So:
x + 10 = 0 or x - 2 = 0
Solving each of these we get:
x = -10 or x = 2
Therefore, the vertical asymptotes of R(x) are: x = -10 and x = 2