Question

if the 9th term of an ap is zero prove that the 29th term is twice of its 19th term

Answer 1

Heya !!




9th term = 0



a + 8d = 0



a = -8d



To prove :



29th term = 2 ( 19th term )




a + 28d = 2 ( a + 18d )



-8d + 28d = 2 ( -8d + 18d )



20d = 2 ( 10d )



20d = 20d.......PROVED....

Answer 2

Helo !




9th term = 0



a + 8d = 0



a = -8d







29th term = 2 ( 19th term )
a + 28d = 2 ( a + 18d )

-8d + 28d = 2 ( -8d + 18d )

20d = 20d..


hence,

lhs = rhs...