Question

What is the fourth term in the expansion of (x + 2)^7?
Answer

280x^4

120x^3

320x^2

168x^4 What is the fourth term in the expansion of (x + 2)^7?
Answer

280x^4

120x^3

320x^2

168x^4 @Mathematics

Answer 1

(r+1)th term of (a + b)^n = nCr a^n-r b^r

Answer 2

look at khayam pascal triangle

Answer 3

well, it's definitely the one with X^4 :)

Answer 4

4th term of (x +2)^7 = 7C3 x^(7-3) 2^3
= 35 x^4 * 8
= 280 x^4