Question

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

Answer 1

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

A) 280x4

B) 168x4

C) 320x2

D) 120x3

Answer 2

@Not_Unknown Do you know the combination?

Answer 3

Combination? The row? I know the row involves 1,7,21,35,35,21,7,1

Answer 4

Yes, 7 C 3 = 35

Answer 5

So the fourth term :
= 7 C 3 * 2³ X⁴
= ....

Answer 6

\[(x+2)^7=x^7+14 x^6+84 x^5+280 x^4+560 x^3+672 x^2+448 x+128 \]\[280 x^4 \]