3^2 +12÷(6-3) ×8
following pemdas ( Please excuse my dear aunt sally)( parentheses, exponents, multiplication, division, addition, subtraction)
you will subtract 3 from 6 since it is in the parentheses, which is 3
3^2+12÷3×8
then do the exponents
9+12÷3×8
then multiplication
9+12÷24
division
9+0.5
addition
=9.5