Question

Find the value of f(9) and g(–9) if f(x) = –7x – 9 and g(x) = 6x3 – 23x.

f(9) = –16
g(–9) = –760

f(9) = –54
g(–9) = 16764

f(9) = –72
g(–9) = –4167

f(9) = 63
g(–9) = 54

Answer 1

Your answer should be A

Explanation:

Answer 2

For this case we have the following functions:

`f (x) = - 7x-9\\g (x) = 6x ^ 3-23x`

We must find
`f (9)` and
`g (-9):`

Substituting we have:

`f (9) = - 7 (9) -9\\f (9) = - 63-9\\f (9) = - 72`

On the other hand:

`g (-9) = 6 (-9) ^ 3-23 (-9)\\g (-9) = 6 (-729) -23 (-9)\\g (-9) = - 4374 + 207\\g (-9) = - 4167`

Answer:

Option C