Question 1055821
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The width of an 18-sq rectangle is 5 cm shorter than twice the length please symbolize and solve the rectangles dimensions 
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W*L = 18.

W = 2L - 5.

====> (2L-5)*L = 18.

2L^2 - 5L - 18 = 0.


{{{L[1,2]}}} = {{{(5 +- sqrt(5^2 - 4*2*(-18)))/(2*2)}}} = {{{(5 +- 13)/4}}}.


The only positive root is L = 4.5.

<U>Answer</U>. The dimensions of the rectangle are 4.5 cm and  2*4.5-5 = 4 cm.
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