Question

plzz help me to solve this question​

Answer 1

ΔABD and ΔPQD are similar, as the corresponding sides are parallel.

      x / z = BD / QD   =>  1/x = QD /(z * BD)

ΔCDB and ΔPQB are similar, as corresponding sides are parallel.

     y / z = BD / BQ   =>  1/y = BQ / (z * BD)

Add the two equations: 

   1/x + 1/y = (BQ + QD) / (z * BD) = 1/ z 

Hope you will like it

PLZZZ MARK IT AS THE BRAINLIEST