To get (f o g)(x), we should replace x in the formula f(x) = 10x^(2)+13x-3 by 5x+1. Doing it mechanically, we get (f o g)(x) = 10*(5x+1)^2 + 13*(5x+1) - 3 = 10*(25x^2 + 10x + 1) + 65x + 13 - 3 = = 250x^2 + 100x + 10 + 65x + 10 = 250x^2 + 165x + 20. ANSWER