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Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Find the zeros of each function. f(x) = x^2 + 5x - 6

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour. what is the cyclist average rate for the round trip in miles per hour ?