Question

The sum of first n term of an ap is given by sn=2n+3n^2 find the common diffrrence

Answer 1

Put n = 1

Then first Term A - 2×1+3×(1)^2 = 5

Sum of 2 terms of ap = 2×2+3(2)^2

=52

Second term = 52-5 = 47

Common difference = 47-5 = 42

AP - 5 , 47 , 89 .....

The given triangle is a right angled triangle

Answered by an expert

Adeeb Khan