1.

Factorise the following expression X square + 2 X Y + Y square minus A square + 2 a b minus b square

Answer»

ANSWER:

(x+y)² - (a-b)²

Step-by-step EXPLANATION:

x² +2xy+y²-a²+2ab - b²

(x+y)² -a²+2ab-b²

-a²+2ab-b² can ALSO be EXPRESSED as

a2-2ab + b²

= (x+y)² + (a-b)²



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