Answer:
c.
Explanation:
We are given that:
[tex]f\mleft(x\mright)=3x^2+3x-1[/tex]
We will proceed to obtain f(3a) as shown below:
[tex]\begin{gathered} f\mleft(x\mright)=3x^2+3x-1 \\ when:x=3a \\ \text{Substitute this into the function, we have:} \\ f(3a)=3(3a)^2+3(3a)-1 \\ f(3a)=3(9a^2)+9a-1 \\ f(3a)=27a^2+9a-1 \\ \\ \therefore f(3a)=27a^2+9a-1 \end{gathered}[/tex]
Therefore, the answer is c
