document.write( "Question 114531: If fifteen less than two times a number is divided by six more than the number, the result is four less than 9 times the reciprocal of that number. Find the number \n" ); document.write( "
Algebra.Com's Answer #83397 by ankor@dixie-net.com(22740)\"\" \"About 
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Let x = \"a number\"
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\n" ); document.write( "Break it down, write an expression for each phrase
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\n" ); document.write( "If fifteen less than two times a number
\n" ); document.write( "2x - 15
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\n" ); document.write( "\"is divided by six more than the number,\"
\n" ); document.write( "\"%28%282x-15%29%29%2F%28%28x%2B6%29%29\"
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\n" ); document.write( "The word \"is\" usually mean \"=\" in these type problems
\n" ); document.write( "\"result is four less than 9 times the reciprocal of that number.
\n" ); document.write( "\"%28%282x-15%29%29%2F%28%28x%2B6%29%29\" = 9*\"1%2Fx\" - 4
\n" ); document.write( "Or
\n" ); document.write( "\"%28%282x-15%29%29%2F%28%28x%2B6%29%29\" = \"9%2Fx\" - 4
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\n" ); document.write( " Find the number
\n" ); document.write( "Multiply equation by x(x+6) to get rid of the denominators
\n" ); document.write( "x(x+6)*\"%28%282x-15%29%29%2F%28%28x%2B6%29%29\" = x(x+6)*\"9%2Fx\" - x(x+6)(4)
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\n" ); document.write( "Cancel the denominators and you have:
\n" ); document.write( "x(2x-15) = 9(x+6) - 4(x^2 + 6x)
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\n" ); document.write( "2x^2 - 15x = 9x + 54 - 4x^2 - 24x
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\n" ); document.write( "Arrange as a quadratic on the left:
\n" ); document.write( "2x^2 + 4x^2 - 15x - 9x + 24x - 54 = 0
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\n" ); document.write( "6x^2 - 54 = 0
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\n" ); document.write( "6x^2 = +54
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\n" ); document.write( "x^2 = \"54%2F6\"
\n" ); document.write( "x^2 = 9
\n" ); document.write( "x = 3 is the number
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\n" ); document.write( "Check solution in our initial equation
\n" ); document.write( "\"%28%282%283%29-15%29%29%2F%28%283%2B6%29%29\" = 9*\"1%2F3\" - 4
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\n" ); document.write( "\"%28%286-15%29%29%2F%28%289%29%29\" = 3 - 4
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\n" ); document.write( "\"%28-9%29%2F9\" = -1; confirms our solution
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\n" ); document.write( "How about this, did I make it understandable to you?
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