Question

ayúdenme xfa.........

Answer 1

K = (n + 1)(n - 3) - ( n - 7) ( n + 5)

K = (n^2 -2n - 3)  - (n^2 -2n -35)

K = n^2 - 2n - 3 - n^2 +2n + 35

K = 32