Coefficient of x−4in⁡32−3x210 is

Suppose x−4 occurs in (r+1)th  term.We have,1Tr+1=10Cr3210−r−3x2r=10Cr3210−r(−3)rx−2rThis will contain x4, if −2r=−4⇒r=2∴ Coefficient of x−4=10C23210−2(−3)2=312×528