I had a tutor explain to me how to do it then I tried the next question on my own and I still got the wrong answer so I’m not sure what I’m doing wrong

Answer:
-5
Explanation:
Given the below expression;
[tex]a^2+6a+3[/tex]To evaluate the above expression when a = -4, all we need to do is to substitute a with -4 and solve as seen below;
[tex](-4)^2+6(-4)+3=16-24+3=-5[/tex]Evaluating the given expression when a = -4 will give us -5 as the answer as seen above.