Question

using identities evaluate:-
9.9×9.5​

Answer 1

Step-by-step explanation:

9.9is also written as 10.5

then 10.5×9.5= (10+0.5)×(10-0.5)

=10²-0.5²

=100-0.25

=99.75

Answer 2

the answer in book is 94.05