Factorise:
(l+m)² - 4lm
Answers
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Answer:
(l-m)^2
Step-by-step explanation:
(l+m)^2-4lm
= (l^2+2lm+m^2)-4lm
= l^2+2lm+m^2-4lm
= l^2-2lm+m^2
=(l-m) ^2
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