Respuesta :

Well if the window is 40 x 10  the L is 52 and the w 22 
irspow
A=xy and we are told y=12+x so

A=12x+x^2 and A=400 so

x^2+12x=400

x^2+12x-400=0

x=(-12±√1744)/2

x≈14.88

So the dimensions are approximately 14.88" by 26.88"

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