### PreCalculus: Average Rate of Change.

Please show work/explain answer. Not sure how to approach this question. Help please. 12) Find the average rate of change of the function: f(x) = (x + 1)2 between x = a and x = a + h Cannot figure out how to factor this equation to find zeros. Please help. 23) Show that x = 3 is a zero for x3 ? x2 ? 11x + 15,