If the sides of a square is increased by 3cm, the area becomes 64 cm^2. How do you find the length of a side of the original square?
The original size was
We know that if the side is increased by
#a >=0#because #a#is a geometrical dimension and they are never negative.
- The area of square with 3 cm longer sides is
#64 cm^2#, so we can write #(a+3)^2=64#
Since we are only looking for positive values of
Now after substracting