41.8k views
3 votes
Keep getting stuck on this question don’t really understand what to do

Keep getting stuck on this question don’t really understand what to do-example-1
User Miguelfg
by
7.1k points

1 Answer

4 votes

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]

User Rigotre
by
8.6k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories