document.write( "Question 233474: The revenue for the sale of x items is determined by the formula R = 50 x – x2. The cost of producing x items is given by the formula C = 2x +40. For what value of x is the profit positive? (Profit = revenue minus cost)\r
\n" ); document.write( "\n" ); document.write( "Do I set it up like this ? 50x-x^2=2x+40 \n" ); document.write( "
Algebra.Com's Answer #172333 by checkley77(12844)\"\" \"About 
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R = 50 x – x2.
\n" ); document.write( "C = 2x +40.
\n" ); document.write( "R-C>0 IS THE PROFIT EQUATION.
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\n" ); document.write( "50X-X^2-(2X+40)>0
\n" ); document.write( "50X-X^2-2X-40>0
\n" ); document.write( "-X^2+48X-40>0
\n" ); document.write( "X^2-48X+40>0
\n" ); document.write( "\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "X=(48+-SQRT[-48^2-4*1*40])/2*1
\n" ); document.write( "X=(48+-SQRT[2,304-160)/2
\n" ); document.write( "X=(48+-SQRT2144)/2
\n" ); document.write( "X=(48+-46.3)/2
\n" ); document.write( "X=(48+46.3)/2
\n" ); document.write( "X=94.3/2
\n" ); document.write( "X=47.15 ANS.
\n" ); document.write( "THIS SAYS THAT AT LEAST 48 UNITS MUST BE SOLD TO HAVE A PROFIT.\r
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