Did you ever learn the multiplication table or longhand division of Whole numbers by Whole numbers ?
That makes it fairly easy to find the two requested numbers. (It can be done mentally.)
I mean, I'm thinking that you should know how to list the Integer factors of 48 by now.
(1)(48)
(2)(24)
(3)(16)
(4)(12)
(6)(8)
Since the product of the two numbers is -48, one of the factors in each pair above must be negative, yes ?
Which such pair of numbers add up to 2 ?