Question

The function is given by the formula f(x)=3x+2.

a) Find f(7)
b) Find the value of x such that f(x)=15

Answer 1

(a) f(7) = 23

(b) x = 13/3

Explanation:

Step 1: Define

f(x) = 3x + 2

(a) f(7) is x = 7

(b) f(x) = 15

Step 2: Substitute and Evaluate

(a) f(7) = 3(7) + 2

f(7) = 21 + 2

f(7) = 23

(b) 15 = 3x + 2

13 = 3x

x = 13/3