Answer:
BD = 17 units
Step-by-step explanation:
BD is the hypotenuse of right triangle BCD, so can be found using the Pythagorean theorem. The opposite sides of a rectangle are the same length, so DC = 8. The theorem tells us
... BD² = DC² +BC² = 8² +15² = 289
... BD = √289 = 17 . . . units
