ok so firstly the answer is: 361
but here is a arw by step solution
3(7+4)^2-14/7
add 7 and 4 to get 11
3 x 11^2 - 14/7
calculate 11 to the power of 2 (121)
3 x 121 - 14/7
multiply 3 and 121 to get 363
363 - 14/7
divide 14 by 7 to get 2
363-2
subtract the two and you get 361