Question

find the x and y if the AP -1, x, y ,14

Answer 1

Given a = -1

And, a4 = 14

a + 3d = 14

3d = 14+1

3d = 15

d = 5

Hence, x = -1 + 5 = 4

            y = -1 + 2(5) = 9

Hence, x = 4 and y = 9