document.write( "Question 1102740: Find the possible value of k for which the quadratic expression 9x^2-2(k+7)x+k is a perfect square. \n" ); document.write( "

Algebra.Com's Answer #717465 by greenestamps(13198) $\"\"$ $\"About$

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\n" ); document.write( "There are none.

\n" ); document.write( "The solutions to the general quadratic equation ax^2+bx+c=0 are given by the quadratic formula:

\n" ); document.write( " $\"x+=+%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F2a\"$

\n" ); document.write( "For the quadratic expression to be a perfect square, the two roots must be the same; that means b^2-4ac must be zero. In this problem,
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\n" ); document.write( "But that expression has no real roots. \n" ); document.write( "

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