Question

IX Std
MAT: Expand by using identities
1) (100 + 3) (100 - 3)
2) (90 + 2) (90 - 2)
3) (50 + 2) (50 - 2)​

Answer 1

Answer:

1. 100^2 - 3^2 = 9991

2. 90^2 - 2^2 = 8096

3. 50^2 - 2^2. = 2496.

all of these using identity (a+b)(a-b)=a^2 - b^2.

i am also in 9th so i think this is the answer.

hope i helped.