Adding and subtracting rational expressions is similar to adding fractions. When adding and subtracting rational expressions, we find a common denominator and then add the numerators. To find a common denominator, factor each first. This strategy is especially important when the denominators are trinomials.
Sample Problems (3)
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What's the probability of pulling an ace out of a deck of cards on your firs try? (Ignore jokers)
What's the probability of rolling a die and getting an even number?
A sock drawer has 4 pairs of white socks, 3 pairs of tan socks, and 3 pairs of black socks. If you pull one pair, what's the probability that it will be white?