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22 March, 10:53

Multiply and simplify: (3x-1) (3x+1)

+4
Answers (2)
  1. 22 March, 10:55
    0
    Easily done

    the fastest way is to recognize the differnce of 2 perfec squares

    (a-b) (a+b) = a²-b²

    sp

    o

    (3x-1) (3x+1) = (3x) ² - (1) ²=9x²-1
  2. 22 March, 11:02
    0
    The answer is 1 thats what I got
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