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ANSWER
f(3) = 28
EXPLANATION
We have the function:
[tex]f(x)=3x^2\text{ + 2x - 5}[/tex]To find the value of f(3), we have to replace x with 3 in the function and simplify:
[tex]\begin{gathered} f(3)=3(3)^2\text{ + 2(3) - 5} \\ f(3)\text{ = (3 }\cdot\text{ 9) + 6 - 5 = 27 + 6 - 5} \\ f(3)\text{ = }28 \end{gathered}[/tex]That is the value of f(3).