SOLUTION: Can someone please help me simplify this problem I am failing my class .Thanks A MILLION? 12- √ [100] + 9²

You can put this solution on YOUR website!
If I understand your problem correctly, it is:
.

.
The square root of 100 is 10 (the number when multiplied by itself results in 100), and
9 squared is 9 times 9 which is 81. Substituting these two values simplifies your problem
to:
.

.
and this is 2 + 81 = 83
.
Hope this helps you understand how to work problems such as these.