Question

plz. solve question 3 &4

Answer 1

Q.3
Given the number is 3 digit odd number
hence it's square will be of minimum 5 digits or max 6 digits
hence option B and option D are eliminated now
if we see option C we will conclude that last digit of perfect t square is 4 hence it's square root will be even but given the no is odd hence option C is also eliminated
So option A is the correct answer
verifying
it is of 6 digits which can be possible and contains odd digit as its unit digit so option A is the correct answer

Q.4
Given cost of one note book is
3a²-4ab+6b²
so for 5a²b² books
it will be
(5a²b²)(3a²-4ab+6b²)
=15a⁴b²-20a³b³+30a²b⁴


hope this helps you....