The absolute term (that is, term independent of x) in the expansion of 32x2−13x9is:

Tr+1=9Cr32x29−r−13xr=9Cr329−r−13rx18−3rFor term independent of x, we set 18-3r=0 or r=6. Thusterm independent of x in the expansion of 32x2−13x9is  9C6329−6−136=718