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anonymous
 4 years ago
The length of a rectangle is 2m more than the width. The area of the rectangle is 20 m^2. Find the dimensions of the rectangle, to the nearest tenth of a metre.
anonymous
 4 years ago
The length of a rectangle is 2m more than the width. The area of the rectangle is 20 m^2. Find the dimensions of the rectangle, to the nearest tenth of a metre.

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0The answer is 3.6 m by 5.6m... how?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0We know that for a rectangle, the area is length x width A = l*w We know that the length is 2 meters more than the width So the the length minus 2 in the width => l  2 = w l = w + 2 Substitutin in the area formula: A = (w+2)(w) 20 = w(w+2) Solve for w using the quadratic equation, then using the w you can find l

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0solve for w using the quadratic equation? so it's going ot be w^2 + 2w  20 = 0

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yup! Oh, but what's a product of 20 and a sum 20? o.o

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Product of 20, sum of 2... Do you know how to use the quadratic equation?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0sort of.. isn't it like factoring?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Its like factoring, but when like integer numbers dont work to solve the equation http://www.oncalc.com/wpcontent/uploads/2011/02/quadraticequationcalculator.gif

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0You see that equation before?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ohhhh the quadratic formula?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yeah, sorry didnt know what you call it

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0it's okay. But what about it? That's all I use after I've figured it's w^2 + 2w  20 =0?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yup, plug it in to the quadratic formula

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Okay, well I got 2 +/ 2sqr.rt:21/2 ...

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0punch that into a calculator and what do you get?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so I don't have to do 2(2 +/ sqr.rt:21/2?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0well what number do you get from that?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Like evaluate the expression

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0(2 + sqrt ( 4  4(1)(20) )/ 2

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0if you do (2  sqrt ( 4  4(1)(20) )/ 2 , you get a negative number, and can omit it because there is no such thing as negaive lengths
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