#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
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
1 answer
1 answer