Let f (x) = 9x - 1 and g (x) = 3x + 1. Find the following.

(a) (f + g) (-2) =

(b) (f/g) (3) =

(c) (f - g) (0) =

(d) (f · g) (2) =

(a) - 24

(b) 2.6

(c) - 2

(d) 119

Step-by-step explanation:

It is convenient to let a calculator or spreadsheet do the function evaluations. That makes the composite functions easier to calculate.

(a) (f+g) (-2) = f (-2) + g (-2) = - 19 + (-5) = - 24

(b) (f/g) (3) = f (3) / g (3) = 26/10 = 2.6

(c) (f-g) (0) = f (0) - g (0) = - 1 - 1 = - 2

(d) (f·g) (2) = f (2) ·g (2) = 17·7 = 119