If, 4+2 = 26, 8+1 = 79 and 6+5 = 111. Then, what is 7+3 = ?

Question

If

2    3 = 9
5    4 = 26
6    2 = 13

Then

7    4 = ??

Answer 1

Theory behind
a+b = cd, where c = (a-b), and d = (a+b)

So,
4+2 = 26......... i.e( 4-2)(4+2)
8+1 = 79.........i.e (8-1)(8+1)
6+5 = 111......i.e (6-5)(6+5)

That means,

7+3 = 410