Question from a, a student:

If the 3rd , 4th, 5th terms in the expansion of (x + a)powe "n" are 720, 1080, 810 respectively, then find the values of x, a and n.

Hi,

I can get you started

hence C_{2} = 720, C_{3} = 1080 and C_{4} = 810. Consider the equations

C_{3}/C_{2} = 1080/720 and C_{4}/C_{3} = 810/1080

Penny