Find the roots of the polynomial function f(x) = 2x2 + 4x2 + 2x.
0 x = 0, x= -1, x = -2
0 x = 0, x = 1 with multiplicity 2
0 x = 0, x=-1 with multiplicity 2

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.