Questions of this sort assume that you know and can do certain things. eg. Do you know the sum of cubes formula?
From 1. it should be obvious that .
Using that result in 2, you get and so .
Now you substitute 7 and 49 into to get the answer: (7)(46) = 322.
Sorry, but you don't seem to have made much effort in trying to follow the help you were given and filling in the details.