A square vegetable field, expand the side length by 3 meters, increase the area by 39 square meters, how much is the original square area

A square vegetable field, expand the side length by 3 meters, increase the area by 39 square meters, how much is the original square area

Original square side length: (39-3 × 3) / (3 + 3) = 6M
Original square area: 6 × 6 = 36 square meters

A square square with a side length of a meter, the side length of the expanded square is 2 meters longer than the original. How many square meters has the expanded square increased?

4+4a

When the side length of a square is increased by 3cm, the area increases to 31 square meters

5.0537764362830022m