document.write( "Question 1144184: The square of a number is equal to 15 more than the twice number. Find all such number.
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Algebra.Com's Answer #765205 by ikleyn(52799) $\"\"$ $\"About$

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document.write( "x^2 = 2x + 15\r\n" );
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document.write( "x^2 - 2x - 15 = 0.\r\n" );
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document.write( "(x-5)*(x+3) = 0\r\n" );
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document.write( "The roots are x= 5  and  x= -3.\r\n" );
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document.write( "Answer.  There are 2 (two) such numbers, 5 and -3.\r\n" );
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