Answers

1. (fg)(x)= x³ – 7x² – 9x + 8

   domain is (-∞,∞)

   Given: f(x)= x-8, g(x)= x² +1x – 1

   To find (fg)(x) we multiply f(x) and g(x)

   (fg)(x) = f(x) * g(x)

   (fg)(x)= (x-8) (x²+x-1)

   (fg)(x)= x³ + x² – x – 8x² – 8x +8

   (fg)(x)= x³  – 7x²  – 9x + 8

   we know, domain for all cubic function is set of all real numbers

   domain is (-∞,∞)

   Know more about “functions” here: https://brainly.com/question/12431044

   #SPJ4

   Reply