Question

evaluate 102*98 using suitable formula

Answer 1

(100+2)×(100-2). [(a+b)(a-b)=a^2-b^2
100^2 - 2^2
10000 - 4
9996

Answer 2

hello

Since there are 102 which is 100+2 and 98 which is 100-2

Therefore we can write it as

(100+2)×(100-2)

now here we can apply a formula ..
which is a^2-b^2 = (a+b)(a-b)

here a=100 and b =2

by using formula we get
100^2 - 2^2
10000 - 4 = 9996

hope it helps
#jerri