SOLUTION: the length of a rectangular frame is 9 cm more than the width. area inside is 90 sq. cm. what's the width of the frame?
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Question 440777: the length of a rectangular frame is 9 cm more than the width. area inside is 90 sq. cm. what's the width of the frame?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
x(x+9)=90
x2+9x=90
x2+9x-90=0
(x+15)(x-6)=0
x=-15 or 6
Throwing out the negative answer, we get the width to be 6 cm., and the length to be 15 cm..
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