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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!
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Do you have pascal's triangle with you?
yes
ok, list out the numbers in the row that starts with "1, 7, etc etc"
like 1,7,21,35?
yes, the fourth number in that sequence is 35, so that will be the value of the coefficient C C = 35
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Ok now what? is that it?
|dw:1429319331928:dw|
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