Solution:
Let the side of original square be x
side of new square = x + 7
area = (x + 7)^2
we are given that area = 225 cm^2
therefore,
(x + 7)^2 = 225
take square root
x + 7 = 15
=> x = 15 - 7 = 8
The length of side of the original square is 8 cm.
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Thanks,
Sandhya
Mathematician
I hold M.Sc and M.Phil degrees in math and have several years of teaching experience.