Question

EXERCISE 14
1. Factorise the following expressions
(vii) (l+ 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)^2

(l+m+√2lm)(l+m-√2lm)