Step-by-step explanation:
let point that BD intersects extended A be Z
angle BDA = 180 - 56 - 78 = 46 deg (supplementary angle in //ogram)
angle AZD = 180 - 98 = 82 deg (angles on a straight line/supplementary angles on straight line)
therefore,
angle x = 180 - 82 - 46 = 52 deg (sum angles of triangle)
