Please help so i can understand with this problem?

Question

. Find AB if BC = 3, BD = 5, and AD = 2.

and tell me how u get the answer

Answer 1

ok lets see. so were trying to get to AB...lets see if we can figure out what A is.

AD= 2  so we have to find what D is

BD=5 so we have to find what B is

BC=3 so B must be 2 and A must be 1

so the answer is 2 is AxB= 2