document.write( "Question 90331This question is from textbook Algebra and Trigonometry
\n" ); document.write( ": From a square piece of cardboard with width x inches, a square of width x-3 inches is removed from the center. Write the area of the remaining piece as a function of x. \n" ); document.write( "

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From a square piece of cardboard with width x inches, a square of width x-3 inches is removed from the center. Write the area of the remaining piece as a function of x.
\n" ); document.write( "large square - inner square
\n" ); document.write( "f(x) = x^2 - (x-3)^2
\n" ); document.write( "f(x) = x^2 - (x^2 - 6x + 9)
\n" ); document.write( "f(x) = x^2 - x^2 + 6x - 9
\n" ); document.write( "f(x) = 6x - 9
\n" ); document.write( ":
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