If x, (3x+5) and (7x+4) form the first three terms of an A.P,
1.Find X
2. Find the 9th term
3x+5 - x = 7x+4 -(3x+5)
2x+5 = 4 x -1
2 x = 6
x = 3
so
3 , 14 , 25
constant difference = 11
a1 + d(n-1)
3 + 11 * 8 = 91
1.Find X
2. Find the 9th term
2x+5 = 4 x -1
2 x = 6
x = 3
so
3 , 14 , 25
constant difference = 11
a1 + d(n-1)
3 + 11 * 8 = 91