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21 August, 12:45

How many terms are in the binomial expansion of (2x + 3) 5?

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  1. 21 August, 15:10
    0
    In (a+b) ^n, there are n+1 terms

    because

    notice

    (ax+b) ^1 = (ax+b), 2 terms, 1+1=2

    (ax+b) ^2 = (ax) ^2+2abx+b^2, 3 terms, 2+1=3

    so

    (2x+3) ^5,

    5+1=6

    6 terms
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