document.write( "Question 63162: A RECTANGLE IS PLACED UNDER THE PARABOLIC ARCH GIVEN BY f(x)=27-3x2 BY USING A POINT (x,y) ON A PARABOLA. WRITE A FORMULA FOR THE FUNCTION A(x) THAT GIVES THE AREA OF THE RECTANGLE AS A FUNCTION OF THE x-COORDINATE OF THE POINT CHOSEN. \n" ); document.write( "
Algebra.Com's Answer #44094 by ankor@dixie-net.com(22740)\"\" \"About 
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A RECTANGLE IS PLACED UNDER THE PARABOLIC ARCH GIVEN BY f(x)=27-3x2 BY USING A POINT (x,y) ON A PARABOLA. WRITE A FORMULA FOR THE FUNCTION A(x) THAT GIVES THE AREA OF THE RECTANGLE AS A FUNCTION OF THE x-COORDINATE OF THE POINT CHOSEN
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\n" ); document.write( "The axis of symmetry will be at 0
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\n" ); document.write( "The height of the square will be y which is 27- 3x^2
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\n" ); document.write( "Length of the square will be 2x
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\n" ); document.write( "A(x) = 2x(27-3x^2)
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\n" ); document.write( "An example when x = 2, Length = 4, y = 15 (height), Area = 15*4 = 60
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\n" ); document.write( "A(2) = 2(2)(27 - 3(2^2)
\n" ); document.write( "A(2) = 4(27 - 12)
\n" ); document.write( "A(2) = 4(15)
\n" ); document.write( "A(2) = 60\r
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\n" ); document.write( "\n" ); document.write( "Looks kind of like this:
\n" ); document.write( "\"+graph%28+300%2C+200%2C+-6%2C+6%2C+-10%2C+30%2C+-3x%5E2+%2B+27%2C+15%29+\"
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\n" ); document.write( "A graph of the area of the rectangle equation:
\n" ); document.write( "\"+graph%28+300%2C+200%2C+-2%2C+6%2C+-10%2C+80%2C+-6x%5E3+%2B+54x+%29+\"
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\n" ); document.write( "As you can probably see I have not done this particular problem before but got
\n" ); document.write( "to thinking about it and this is what I came up, hope it's helpful
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