Question

factorise the following by using identities: (1) 4x^2-81y^2​

Answer 1

Answer:

(2x+3y)(2x−3y)

Step-by-step explanation:

4x  

2

−81y  

2

 

               =(2x)  

2

−(9y)  

2

  ---------Using a  

2

−b  

2

=(a+b)(a−b)

               =(2x+3y)(2x−3y)