Question

17. Use suitable identity to solve: a) 1992 b) 47 x 53​

Answer 1

Answer:

I don't know of A it is of B

Step-by-step explanation:

Given, 47×53

=(50−3)(50+3).

We know, (a+b)(a−b)=a

2

−b

2

.

Then,

47×53=(50−3)(50+3)

=(50)

2

−3

2

=2500−9=2491.