A square, increase its length by 6 cm, its area will increase 156 square cm, how much is the original square area? (can't use the equation) urgent!

A square, increase its length by 6 cm, its area will increase 156 square cm, how much is the original square area? (can't use the equation) urgent!

So, the side length of the square is (156-6 × 6) △ 2 △ 6 = 10 (CM). The original area of the square is: 10 × 10 = 100 (CM)