Question

Can you check my answers?

1.Find the 5th term in the expansion of the binomial.

(2x - 4)8


-458,752x3

286,720x4

458,752x3

35,840x4

answer: d


2.Find the 3rd term in the expansion of the binomial.

(x - 2y)12


264x10y2

1760x9y3

-264x10y2

-1760x9y3

answer:a

Answer 1

#1
term(5) = C(8,4) (2x)^4 (-4)^4
= 70(16x^4)(256)
= 286720 x^4 <-------- B

general term of (a+b)^n:
term (k+1) = C(n,k) * (a)^(k-1) * b^k

#2, correct