One factor of f(x) - 5x3 + 5x2 - 170x+ 280 is (x + 7). What are all the roots of the function? Use the Remainder Theorem.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a