Question

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

Answer 1

Answer:

Your answer should be A

Step-by-step 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