Factor:
n^4- 3n^2 + 2

*example: n^2-n-2 factored would be: (n-2)(n+1)*

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%