Arthur D. answered 09/25/18
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w=width
w+15=length
w(w+15)=1350
w^2+15w-1350=0
1350=2*3*3*3*5*5=(2*3*5)*(3*3*5)=30*45
(w+45)(w-30)=0
w-30=0
w=30
w+15=45
30 in by 45 in
I used algebra but as you can see it only amounts to factoring 1350 and grouping the factors the right way.