Question

If a,b,c are in AP then what is a³+c³-8b³?

Answer 1

Step-by-step explanation:

2b = a+c

(2b)^3 = (a+c)^3

8b³ = a³+c³ +3ac(a+c)

a³+c³-8b³ = -3ac(a+c)