Add and subtract
$(i) m - n, m + n$
$(i i) m n + 5 - 2, m n + 3$

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Solution

$P a r t (i)$
$A d d$
$= m - n + m + n = 2 m$
$S u b t r a c t$
$= m - n - m - n = - 2 n$

$P a r t (i i)$
$A d d$
$= m n + 5 - 2 + m n + 3 = 2 m n + 6$
$S u b t r a c t$
$= m n + 5 - 2 - m n - 3 = 0$

Hence, this is the answer.

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