Question

evaluate using identity (b) (4×-4) (4×-1)​

Answer 1

[ (a+b) -4 ] [ (a+b) +4 ]

= (a+b)² - (4)² ; { using identity (x-y)(x+y) = x²-y² }

= a²+b²+2ab-16

Answer 2

Answer:

12 is the right answer.