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

Question

Mathematics

Braden Owen

4 July, 09:55

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

+2

Answers (1)

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Tabitha Chen · Answer 1

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

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

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