Question

6. Using suitable identity, find the following products
a) 6.1 x 5.9 b) & + 1)2 c) 107 x 98​

Answer 1

C) 107×98

(100+7) (100+(-2))

(x+a) (x+b) = x² + (a+b)x + ab

(100+7) (100 + (-2)) = (100)² + (7+(-2)×100 + 7×(-2)

= 10000 + 500 + (-14)

= 10,486

hope it helps :)

You can verify the answer by directly multiplying 107×98

and you will get 10,486.