Question

what will be the answer of this question???

Answer 1

m - n = a^2 + ab - (c^2 + bc)
=a^2 - c^2 - bc + ab
=(a-c)(a+c) + b(a-c)
=3(a+c) + 3b
=3(a+b+c)
=3(12)
=36...