Class 9th math Rs aggarwal exercise 3B

 Factorisation of polynomial

Exercise 3B

All question in one video

In this video questions are 

Q.1 9x^2-16y^2

Solution:- Given 9x^2-16x^2

= (3x)²-(4y)²

= (3x+4y) (3x-4y) 

Q.2 [(25/4)x^2-(1/9)y^2]

Solution:- [(25/4)x^2-(1/9)y^2]

= [(5/2)x]²-[(1/3)y]²

=[(5/2)x+(1/3)y] [(5/2)x-(1/3)y]