What expression are you talking about? I don't think you added it.
Answer:

Step-by-step explanation:

Standard form: 
Our vertex is: 
Finally we get
as our answer.
Have an amazing day!
Answer:
the answer is 8
Step-by-step explanation:
a2+3b÷c-2d
3×2+3×8÷2-10
6+24÷2-10
6+12-10
18-10
=8