Question 89724
157^2=24,649 sq ft.
155*159=24,645 sqft.
24,649-24,645=4 sq ft. short.
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there is a short cut to these type of problems thus:
(x-2)(x+2)=x^2-4 or the loss is 4 from the original size of the square.
(x-10)(x+10)=x^2-100