Question

Factorise the following expression
9z2–x2–4y2+ 4xy

Answer 1

9z2 – x2 + 4xy – 4y2 = (3z)2 – [x2 – 2 (x) (2y) + (2y)2] = (3z)2 – (x – 2y)2 = [(x – 2y) + 3z] [–x + 2y + 3z)]Read more on Sarthaks.com - https://www.sarthaks.com/643611/factorize-each-of-the-following-algebraic-expressions-9z-2-x-2-4xy-4y-2?show=643622#a643622

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