Question

If the sum of first m terms of an A.P. is am^2 +bm. Find it's common difference​

Answer 1

Answer:

2q

Step-by-step explanation:

Sm = m/2 (2A+ (m-1)d)

where, A is first term and d is common difference.

= m²d/2 + (A -d/2)m = am² + bm

Comparing, coefficients

d/2 = a

=> d = 2a