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Mathematics 7 Online
OpenStudy (anonymous):

Hi, I need some help. find the fourth term in the expansion of (3x+y)^7 Could somone tell me what it is, and also explain it please? thanks!

jimthompson5910 (jim_thompson5910):

Do you have pascal's triangle with you?

OpenStudy (anonymous):

yes

jimthompson5910 (jim_thompson5910):

ok, list out the numbers in the row that starts with "1, 7, etc etc"

OpenStudy (anonymous):

like 1,7,21,35?

jimthompson5910 (jim_thompson5910):

yes, the fourth number in that sequence is 35, so that will be the value of the coefficient C C = 35

jimthompson5910 (jim_thompson5910):

|dw:1429319314234:dw|

OpenStudy (anonymous):

Ok now what? is that it?

jimthompson5910 (jim_thompson5910):

|dw:1429319331928:dw|

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