$a\text{)}\left(x+3\right)\left(y+4\right)=xy+4x+3y+12$  

$b\text{)}\left(m+6\right)\left(n-2\right)=mn-2m+6n-12$  

$c\text{)}\left(a-7\right)\left(b-3\right)=ab-3a-7b+21$  

$d\text{)}\left(2+x\right)\left(3+2y\right)=6+4y+3x+2xy$  

$e\text{)}\left(5m+1\right)\left(3-n\right)=15m-5mn+3-n$  

$f\text{)}\left(5-2p\right)\left(3q-2\right)=15q-10-6pq+4p$  

$g\text{)}\left(2a-3\right)\left(3b-4\right)=6ab-8a-9b+12$