Question

factorise (I+m)2-4lm
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Answer 1

Answer:

(l+m)^2 - 4lm

=> l^2 + m^2 + 2lm - 4lm

=> l^2 + m^2 - 2lm

=> l^2 + m^2 - 2(l)(m)

=> (l-m)^2