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18 March, 13:45

A frame of width a surrounds a 5 by 7 inch photograph. Find the expression that represents the area of the frame in terms of a.

a 2 - 35a 2 + 12a4a 2 + 24aNone of these

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  1. 18 March, 15:19
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    See diagram

    totalarea=totallengtht times totalwidth = (2a+5) times (2a+7) = 4a²+24a+35

    minus original aera

    which is 5 by 7 which is 35

    4a²+24a+35-35=4a²+24a

    3rd option I think, can't tell which is which
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