Question

find the square using the identity (a+b)²=a²+2ab+b² or ( a+b)²=a²-2ab+b²
1. 1001²=
2. 99²= ​

Answer 1

Answer:

(1000+1)^2 = 1000000+1+ 2000

= 1002001

(100-1)^2. =. 10000+1-200

=. 9799

Answer 2

1. (1001)2

(1000+1)(1000+1)

(a+b)2= a2 + 2ab + b2

(1000+1)2 = (1000)2 + 2×1000×1 + (1)2

= 1000000 + 2000 + 1

= 1002001

2. (99)2

(100-1) (100-1)

(a-b)2= a2 - 2ab + b2

(100-1)2 = (100)2 - 2×100×1 + (1)2

= 10000 - 200 + 1

= 9801

it's your answer

I hope helps you