Question

(i) 4 - (l - m)^2 .
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Answer 1

Answer:

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

Step-by-step explanation:

Let's use properties

(a-b)^2= a^2 +b^2 -2ab

so (l-m)^2= l^2+m^2-2lm

4-(l^2 + m^2 - 2lm)

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

Answer 2

Answer:

(2+l-m)(2-l+m)

Step-by-step explanation:

I am changing l to x and m to y

m=y

l=x

$4 - (x - y) {}^{2} \\ = (2 + x - y)(2 - x + y)$

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