Suppose: bamboo breaks at x feet above the ground. Then: the length of the broken and dumped part of bamboo is 10-x feet.

According to the meaning of the question and the known situation, there are: (10-x) 2 = x2+3 2.

Namely: x 2-20x+ 100 = x 2+9.

Finishing: 20x=9 1

Solution: x=4.55 (feet)

A: Bamboo broke at 4.55 feet above the ground.