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30 June, 06:13

Find the product mentally.

(ab + 3) (ab - 3)

A: a2b2 + 9

B: a2b2 - 6ab - 9

C: a2b2 - 9

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Answers (1)
  1. 30 June, 09:55
    0
    (ab+3) (ab-3)

    = (ab+3) (ab+-3)

    = (ab) (ab) + (ab) (-3) + (3) (ab) + (3) (-3)

    =a^2b^2-3ab+3ab-9

    =a^2b^2-9
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