A=lw
56=lw
P=2l+2w
60=2l+2w
30=l+w
30-w=l
56=(30-w)w
56=30w-w2
w2-30w+56=0
56=2*2*2*7=(2)*(2*2*7)=2*28
(w-2)(w-28)=0
w-2=0
w=2
w-28=0
w=28
l=28 units and w=2 units
all this amounts to is: 60/2=30, now find two addends that add up to 30 and multiply to make 56 (2 and 28)