Question

If f(x) =2x - 3, find the following

1. f(-2)
2. f(7)
3. f(-4)

Answer 1

1. f(-2) = -7

2.f(7) = 11

3. f(-4) = -11

Explanation:

1. substitute x = -2 in f(x)

The function becomes :

f(-2) = 2×(-2) - 3 = -7

2. substitute x = 7 in f(x)

the function becomes:

f(7)= 2×7 - 3 = 11