document.write( "Question 511720: find the whole number such that four times the number subtracted from three times the square of the number makes 15 \n" ); document.write( "
Algebra.Com's Answer #342374 by nerdybill(7384)\"\" \"About 
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find the whole number such that four times the number subtracted from three times the square of the number makes 15
\n" ); document.write( ".
\n" ); document.write( "Let x = the number
\n" ); document.write( "then
\n" ); document.write( "3x^2 - 4x = 15
\n" ); document.write( "3x^2 - 4x - 15 = 0
\n" ); document.write( "replace -4x with:
\n" ); document.write( "3x^2 - 9x + 5x - 15 = 0
\n" ); document.write( "group terms:
\n" ); document.write( "(3x^2 - 9x) + (5x - 15) = 0
\n" ); document.write( "factor:
\n" ); document.write( "3x(x - 3) + 5(x - 3) = 0
\n" ); document.write( "(x - 3)(3x + 5) = 0
\n" ); document.write( "x = {3, -5/3}
\n" ); document.write( "throw out the fraction since we're looking for whole numbers
\n" ); document.write( "x = 3 \n" ); document.write( "
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