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23 November, 18:28

Choose the correct product of (9x - 5) (9x + 5).

81x2 + 90x + 25

81x2 - 25

81x2 + 25

81x2 - 90x + 25

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Answers (1)
  1. 23 November, 19:48
    0
    Hi,

    (a+b) (a-b=a²-b²

    Thus (9x) ²-5²=81x²-25
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