document.write( "Question 1208029: A certain number is subtracted 4 times from twice from square of the number and the result is 70. Find the number \n" ); document.write( "

Algebra.Com's Answer #846153 by ikleyn(52786) $\"\"$ $\"About$

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\n" ); document.write( "A certain number is subtracted 4 times from twice from square of the number
\n" ); document.write( "and the result is 70. Find the number.
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\n" ); document.write( "\n" ); document.write( " I edited your post in order for to make sense from nonsense.\r
\n" ); document.write( "\n" ); document.write( " The edited problem is THIS:\r
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document.write( "    |   A certain number is subtracted 4 times from twice the square  |\r\n" );
document.write( "    |      of the number and the result is 70. Find the number.       |\r\n" );
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document.write( "                         Solution\r\n" );
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document.write( "Let n be the (or \"a\") number under the problem's question.\r\n" );
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document.write( "Then, according to the condition, we have this equation\r\n" );
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document.write( "    2n^2 - 4n = 70,\r\n" );
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document.write( "    n^2 - 2n - 35 = 0,\r\n" );
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document.write( "    (n-7)*(n+5) = 0.\r\n" );
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document.write( "So, there are two roots and two possible answers: the number is either -5 or 7.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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