Question

if the nth term of AP is 4n+5, then common differenc

Answer 1

Given that,

an = a + (n-1)d = 4n + 5

⇒ a + (n-1)d = 9 + (n-1)4

Comparing the coefficients on both sides of the equation, we get

a = 9 , d = 4

∴ the common diff. is d =4