Find the sum of the first 41 terms of the following series, to the nearest integer. 4 , 12 , 20 , . . .

If (x + 8) is a factor of f(x), which of the following must be true? both x = –8 and x = 8 are roots of f(x). neither x = –8 nor x = 8 is a root of f(x). f(–8) = 0 f(8) = 0