Question

Which of the following function map 3 to -5?

Answer 1

B

Explanation:

Consider all options and find f(3):

A.
`f(x)=x-5`

Then

`f(3)\\ \\=3-5\\ \\=-2`

Not -5, so this option is false.

B.
`f(x)=4-x^2`

Then

`f(3)\\ \\=4-3^2\\ \\=4-9\\ \\=-5`

This option is true.

C.
`f(x)=x+8`

Then

`f(3)\\ \\=3+8\\ \\=11`

Not -5, so this option is false.

D.
`f(x)=-x+2`

Then

`f(3)\\ \\=-3+2\\ \\=-1`

Not -5, so this option is false.