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7 March, 10:29

Multiply and simplify: (6x + 3y) (6x - 3y)

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Answers (2)
  1. 7 March, 10:45
    0
    36x² - 9y²

    Step-by-step explanation:

    (6x + 3y) (6x - 3y)

    (6x) ² - (3y) ²

    36x² - 9y²
  2. 7 March, 10:53
    0
    36x² - 9y²

    Step-by-step explanation:

    We see that the given expression (6x + 3y) (6x - 3y) looks just like the expression (a + b) (a - b). When multiplied out, this is a difference of squares identity that I highly recommend you memorise:

    (a + b) (a - b) = a² - b²

    Here, a = 6x and b = 3y, so plug these in:

    (6x + 3y) (6x - 3y) = (6x) ² - (3y) ² = 36x² - 9y²
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