Grade 11Algebra
if 9th term of an A.P. is zero,prove that 29th term is double than the 19th term
if 9th term of an A.P. is zero,prove that 29th term is double than the 19th term
1 Answer
Mohd Shoaib
As a9 = o So, a + 8d = 0 a = -8d............ ...(i)Now , a29 = a + 28d a29 = -8d + 28da29 = 20d................(ii)a19 = a+ 18da19 = -8d + 18da19 = 10d.................(iii)Now from eq (ii) and (iii) 20d = 2* 10 da29 = 2*a19Hence proved......
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