Question 674724
100*50=5000 sq. feet is the area.
(100+x)(50+x)=3*5000
5000+50x+100x+x^2=15000
x^2+150x+5000-15000=0
x^2+150x-10000=0
(x-50)(x+200)=0
x-50=0
x=50 feet must be added to triple the area.
Proof:
(100+50)(50+50)=15000
150*100=15000
15000=15000