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nth term in an expansion

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RUmolarman

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Heres a QR question from TOPSCORE 2....
What is the third term in the expansion of (x+3)^5
Answer= 90x^3


How do you get this??
 

old-school

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In your college algebra book, look up pascal's triangle ie.
1
1 1
1 2 1
1 3 3 1 et. @ x^5 you hit 1 5 (10) a^2= 9(10)x^3
 
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