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23 September, 14:09

Write in standard form. (3y-5) (3y+5)

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  1. 23 September, 16:49
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    (3y-5) (3y+5)

    Let's start with the formulae

    (a+b) (a-b) = a^2-b^2

    Let insert it into the equation, we have

    (3y-5) (3y+5) = (3y) ^2 - (5) ^2

    3y (3y) - 5 (5)

    9y^2-25. Ans
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