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16 July, 13:12

Expand and simplify (x+3) (x-3) (3x+2)

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Answers (2)
  1. 16 July, 13:17
    0
    (x+3) (x-3) results in a product which is the difference of two squares: x^2 - 3^2.

    Multiply this (x^2 - 3^2) by the third factor, (3x+2):

    3x^3 - 9x + 2x^2 - 3^2*2, or, in descending order by powers of x,

    3x^3 + 2x^2 - 9x - 18
  2. 16 July, 13:19
    0
    I think it would be 3x³ + 2x² - 27 - 18
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