x + z = 2y, b2 = ac হলে, ay - z · bz - x · cx - y =?

প্রশ্ন: x + z = 2y, b2 = ac হলে, ay - z · bz - x · cx - y =?সমাধান:x + z = 2y⇒ x + z = y + y∴ x - y = y - zএখন,ay - z · bz - x · cx - y= ax - y × bz - x × cx - y [y - z = x - y]= (ac)x - y × bz - x= (b2)x - y × bz - x= b2x - 2y + z - x = bx + z - 2y= b2y - 2y= b0= 1