Question

Suppose we have two functions: f(x)=x2+1 and g(x)=3x +5.Find the value of f(- 1)g(-1).

Answer 1

4

Explanation:

We have the following functions:

`\begin{gathered} f\mleft(x\mright)=x^2+1 \\ g\mleft(x\mright)=3x+5 \end{gathered}`

We calculate the value of the function when x is equal to -1:

`\begin{gathered} f(-1)=-1^2+1=1+1=2 \\ g(-1)=3\cdot-1+5=-3+5=2 \\ \text{now,} \\ f(-1)\cdot g(-1)=2\cdot2=4 \\ f(-1)\cdot g(-1)=4 \end{gathered}`

The value of the product of the two functions is equal to 4