Respuesta :

First you must know this   a∧n * a∧m = a∧(m+n)

Now we will solve this

(7a∧4b) * (8a∧7b∧6) = (7*8) (a∧4*a∧7) (b*b∧6) = 56* a∧(4+7) * b∧(1+6) = 56 a∧11 b∧7

Good luck!!!