EpicMLGPlayar EpicMLGPlayar
  • 23-09-2017
  • Mathematics
contestada

The rectangle below has an area of x^2-144 square meters and a length of x+12 meters. What expression represents the width of the rectangle?

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coolstick
coolstick coolstick
  • 23-09-2017
Since length*width=area, (x+12)*width=x²-144. Dividing (x+12) from both sides, we get (x²-144)/(x+12)=width. One formula we can use is that
(a²-b²)=(a-b)*(a+b). Since 144=12², that means that x²-144=(x-12)*(x+12). Plugging that in, we get (x-12)*(x+12)/(x+12)=(x-12)=width
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lucia1209
lucia1209 lucia1209
  • 02-04-2020

x-12 meters

(just did the question, got it right) i hope this helps!! :)

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