Let f(x) = 3x - 1. Simplify each of the following expressions. f(a) = 3a - 1 f(a + h) = 3(ath) - 1 3a + 3h - 1 f (a + h ) - f (a ) = X (Make sure to expand and combine like terms.) f(a + h) - f(a) = * (Make sure to cancel out the factor of h in the denominator.) h