Question

factorise the following expressions
a) ( L + m )^2 - 4lm

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

(l+m)²-4lm

l²+m²+2lm-4lm {(a+b)²=a²+b²+2ab}

l²+m²-2lm

(l-m)² {(a-b)²=a²+b²-2ab}

(l-m)(l-m)