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23-04-2020
Mathematics

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The width of a rectangle is 7 inches shorter than its length. The area is 78 square inches. What are the dimensions of the rectangle?

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23-04-2020

Answer:

Step-by-step explanation:W = L - 7

WL = 78

(L-7)L = 78

L^2 - 7L - 78 = 0

Factorize: (L-13)(L+6) = 0

L = 13 or -6

A length cannot be negative, so the length must be 13 miles.

The width is 13-7 = 6 miles.

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