If a polynomial function f(x) has roots -2+ square root of 8 and 9, what must be a factor of f(x)?

In a gallup poll, 750 randomly selected adults were asked whether they are in favor of the death penalty for a person convicted of murder, and 75% of them said that they were in favor. construct and interpret a 99% confidence interval of the percentage of all adults who are in favor of this death penalty. round to 2 decimals.