517,877 views
35 votes
35 votes
Perform the requested operation or operations.Find the domain of each.please I really need help!!

Perform the requested operation or operations.Find the domain of each.please I really-example-1
User Eugene Myasyshchev
by
2.8k points

1 Answer

22 votes
22 votes

Given the Functions


\begin{gathered} f(x)=5x+5 \\ g(x)=6x^2 \end{gathered}

Find: (fg)(x).

It's required to find the product of f and g, thus:


\begin{gathered} (fg)(x)=(5x+5)(6x^2) \\ (fg)(x)=30x^3+30x^2 \end{gathered}

The domain of this function is the set of all real numbers because x can take any real value and the function will exist, thus the answer is (third choice):


\begin{gathered} 30x^3+30x^2 \\ \text{Domain: } \\ (-\infty,+\infty) \end{gathered}

User Force Hero
by
2.7k points