document.write( "Question 757610: For what value of k, -4 is a zero of the polynomial x2 – x – (2k + 2)? \n" ); document.write( "

Algebra.Com's Answer #460932 by MathLover1(20849) $\"\"$ $\"About$

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$\"x%5E2+%96+x+%96+%282k+%2B+2%29=0\"$ \r
\n" ); document.write( "\n" ); document.write( "if $\"x=-4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"%28-4%29%5E2+%96+%28-4%29+%96+%282k+%2B+2%29=0\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"16+%2B4+%96+2k-+2=0\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"16+%2B4-2=2k\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"18=2k\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"18%2F2=k\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28k=9%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%5E2-x+-%282k+%2B+2%29=0\"$ ........plug in $\"highlight%28k=9%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%5E2-x+-%282%2A9+%2B+2%29=0\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%5E2-x+-%2818+%2B+2%29=0\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%5E2-x+-20=0\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2Cx%5E2-x-20%29+\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "as you can see, $\"-4\"$ is a zero of the polynomial $\"x%5E2-x-20=0\"$ \r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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