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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?

2 Answers

7 votes

Answer:

a is the right answer

Explanation:

User Jay Nanavaty
by
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4 votes
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

User Bbc
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