Question

A function is given.

​
​ f(x)=2x+3
​
​What is the value of f(−2)?

f(−2) = ?

Answer 1

f(- 2) = - 1

Explanation:

To evaluate f(- 2) substitute x = - 2 into f(x), that is

f(- 2) = 2(- 2) + 3 = - 4 + 3 = - 1

For
`2^(x)` + 3, then

f(- 2) =
`2^(-2)` + 3 =
`(1)/(4)` + 3 = 3.25