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23 July, 20:05

If the dimensions of a rectangle are a+3b and a-3b, what is the area of the rectangle in terms of a and b?

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  1. 23 July, 20:55
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    Area=legnth times width

    we notice this is a special case

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

    area = (a+3b) (a-3b) = a^2-9b^2

    area=a^2-9b^2
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