if the sides of a square are lengthened by 3 m, the area becomes 81 m2. Find the length of a side of the original square.
1 answer:
Answer:
The length of a side of the original square is 6 meters
Step-by-step explanation:
Let
x ----> the length side of the original square
The area of a square is equal to

where
b is the length side of the square
In this problem
The new length side of the square is
and the area is 
so

solve for x
take square root both sides


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