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AP&GP math?

1. If the first three terms of the expansion of (a+3x)^n are b+(21bx/2)+(189bx^2/4), find the value of a,b and n.

1 Answer

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  • DWRead
    Lv 7
    4 years ago
    Favorite Answer

    a = 2

    n = 7

    b = 128

    Attachment image
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