Question

Keep getting stuck on this question don’t really understand what to do

Answer 1

The Solution:

Given the functions below:

`\begin{gathered} f(x)=-4x-8 \\ \text{and} \\ g(x)=3x^2+x \end{gathered}`

We are required to find the value of f(-1)g(2)

So,

`f(-1)\text{ means that we should substitute -1 for x in f(x)}`
`f(-1)=-4(-1)-8=4-8=-4`

Similarly,

g(2) means we should substitute 2 for x in g(x).

`g(2)=3(2)^2+2=3(4)+2=12+2=14`

Now, we shall multiply f(-1) and g(2) together.

`f(-1)g(2)=f(-1)* g(2)=-4*14=-56`

Therefore, the correct answer is [option C]