求數學高手進來..

這是二項式定理..
in the expansion of (2x^2+1)^n in ascending powers of x,where n is a positive integer,the coefficient of the third term is 60.find the value of n and the coefficient of x^8
ans:
n=6 coefficient =240
請問有誰可以把步驟告訴我？..
幫幫我吧.
唔該啦..