Question

please please please explain this question ​

Answer 1

2) 211*189

(200+11) * (200- 11)

( a+ b) ( a - b)

= 39879

3) 195 * 205

(200+5) (200-5)

40000 - 25

= 39975

Answer 2

Answer:

i) (200+11) *(200-11)

using identity (a+b) (a-b)= a²-b²

(200)² - (11)²

40000 - 121

39879