Subtract : $3 l (l - 4 m + 5 n)$ from $4 l (10 n - 3 m + 2 l)$ .

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Solution

We have to subtract $3 l (l - 4 m + 5 n)$ from $4 l (10 n - 3 m + 2 l)$
i.e. $4 l (10 n - 3 m + 2 l) - 3 l (l - 4 m + 5 n)$
$= 40 l n - 12 l m + 8 l^{2} - (3 l^{2} - 12 l m + 15 l n)$

$= 40 l n - 12 l m + 8 l^{2} - 3 l^{2} + 12 l m - 15 l n$

$= 5 l^{2} + 25 l n$

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