The following answer is correct. However, it is worthwhile to note that this problem involves a basic understanding of the order of operations (PEMDAS).
The problem states that 8 is to be multiplied by the SUM (emphasis added) of 3^2 and 4^3. Thus, 3^2 and 4^3 must be evaluated (exponeniation must be carried out first due to PEMDAS rules) first and the results added together. Then we multiply the SUM by 8.
Recall that addition is performed last, according to the PEMDAS hierarchy.