Question

Using identities evaluate :(99)^2
(ii) Expand (3m^2n + 5/6mn^2)^2
12. 10410 students are sitting in an auditorium in such a manner that there are as many
students in a row as there are rows in an auditorium. If there are 6 students left How many
students are there in each row of a lecture room?
13. The digits of a two-digit number differ by 3. If digits are interchanged and the resulting
number is added to the original number, we get 121. Find the original number.

Answer 1

Answer:

1. 99's square

Step-by-step explanation:

99's square= (100-1)^2

by(a-b)^2=a^2 -2ab+b^2