Answer :
You have the next expression:
[tex]9+\sqrt[]{81}-4\cdot2[/tex]The order of operations is:
1. Multiplications and divisions (left to right)
2. Addition and substraction (left to right)
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As you have a square root this is the first operation:
As 81 is a perfect square you know that:
[tex]\sqrt[]{81}=9[/tex][tex]9+9-4\cdot2[/tex]Then, You make the multiply of (4*2)
[tex]9+9-8[/tex]And finally you make the additions and substractions:
[tex]9+9-8=10[/tex]