WhyIsSchoolSoHard WhyIsSchoolSoHard

01-10-2018
Mathematics

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The length of a rectangular picture frame is 7 inches less than twice its width. The area is 60 square inches. What is the length of the frame?

Respuesta :

vtorres61 vtorres61

04-10-2018

L=2w-7 and A=Lw, therefore:

(2w-7)(w)=60

2w^2 -7w=60

2w^2-7w-60=0

(w+4)(2w-15)=0 Only solve where w is positive.

2w-15=0

w=7.5

L=8

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