Question

What is the second term in the expansion of (2x + 7)6?



1344x4


23,520x5


1344x5


23,520x4

Answer 1

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

Answer 2

in this case r = 1, n = 6 , a = 2x and b = 7

Answer 3

so (2x+7)^6= 6^(6-1)???

Answer 4

no

6C2 (2x)^5 * 7^1

Answer 5

Sorry that' s nC1 which = 6

Answer 6

(2x)^5 = 32 x^5 and 7^1 = 7

Answer 7

so 32x^5*7

Answer 8

6C1 = 6

Answer 9

you forgot the 6

Answer 10

6C1 * 32x^5 * 7
= 6 * 32x^5 * 7

Answer 11

32x^5 * 42

Answer 12

right
Now sismplify some more

Answer 13

ok so how would i simlify it more ??

Answer 14

just multiply 32 by 42

Answer 15

1344x^5 right

Answer 16

yes Thats the 3rd choice

Answer 17

ok thank yo

Answer 18

yw