Q4 of 274 Page 64

Factorize:

(3x + 5y)2 – 4z2

We have,



We can also write the expression as:


(3x + 5y)2 – (2z)2


Now,


Using identity: a2 – b2 = (a – b)(a + b)



Hence,


The given expression can be factorized as:


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