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Kipish
[7]
3 years ago
11
A rectangle's width is 2 meters shorter than its length ,/. It's area is 168 square meters . Which equation can be used to find
the length of te rectangle?
Mathematics
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dusya
[7]
3 years ago
7
0
Let x be the length of the rectangle, then its width is x-2.
The area of a rectangle is L x W OR x.(x-2). Expand it = x² - 2x = AREA.
Or x² - x = 168
x²-2x-168 = 0. This is a quadratic equation to solve for x:
x' = [-b+√(b²-4ac)]/2a and x" = [-b-√(b²-4ac)]/2a
you will find x' =14 and x" = -12 (extraneous value not to be considered), so
x=14
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