document.write( "Question 1050396: Assume that x=2 is a zero of f(x)=x^2+3kx+2k^2 (that is, f(2)=0). Find the value(s) of k.\r
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\n" ); document.write( "\n" ); document.write( "This is a question to help me better understand what I missed in class the other day; I have a quiz tomorrow! Please help!\r
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Algebra.Com's Answer #665959 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
The idea is to plug in x = 2 and replace f(2) with 0. Then solve for k.\r
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\n" ); document.write( "\n" ); document.write( "\"f%28x%29=x%5E2%2B3kx%2B2k%5E2\" Start with the given function\r
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\n" ); document.write( "\n" ); document.write( "\"f%282%29=%282%29%5E2%2B3k%2A%282%29%2B2k%5E2\" Replace every x with 2\r
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\n" ); document.write( "\n" ); document.write( "\"f%282%29=4%2B6k%2B2k%5E2\" Simplify\r
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\n" ); document.write( "\n" ); document.write( "\"0=4%2B6k%2B2k%5E2\" Replace the \"f(2)\" with 0\r
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\n" ); document.write( "\n" ); document.write( "\"0=2k%5E2%2B6k%2B4\" Rearrange terms\r
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\n" ); document.write( "\n" ); document.write( "\"2k%5E2%2B6k%2B4=0\" Flip the equation\r
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\n" ); document.write( "\n" ); document.write( "\"2%28k%5E2%2B3k%2B2%29=0\" Factor out the GCF 2\r
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\n" ); document.write( "\n" ); document.write( "\"%282%28k%5E2%2B3k%2B2%29%29%2F2=0%2F2\" Divide both sides by 2\r
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\n" ); document.write( "\n" ); document.write( "\"k%5E2%2B3k%2B2=0\" Simplify\r
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\n" ); document.write( "\n" ); document.write( "\"%28k%2B1%29%28k%2B2%29=0\" Factor the left side\r
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\n" ); document.write( "\n" ); document.write( "\"k%2B1=0\" or \"k%2B2=0\" Use the zero product property. Then isolate k for each equation.\r
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\n" ); document.write( "\n" ); document.write( "\"k%2B1-1=0-1\" or \"k%2B2-2=0-2\"\r
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\n" ); document.write( "\n" ); document.write( "\"k=-1\" or \"k=-2\"\r
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\n" ); document.write( "\n" ); document.write( "So the values of k are \"k=-1\" or \"k=-2\"
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