document.write( "Question 917247: Prove that x=2 is a real zero of y=-x^3+7x^2-55x+90 \n" ); document.write( "
Algebra.Com's Answer #556583 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
An alternative easier proof is to plug x = 2 into the equation and evaluate.\r
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\n" ); document.write( "\n" ); document.write( "y=-x^3+7x^2-55x+90\r
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\n" ); document.write( "\n" ); document.write( "y=-(2)^3+7(2)^2-55(2)+90\r
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\n" ); document.write( "\n" ); document.write( "y=0\r
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\n" ); document.write( "\n" ); document.write( "Since we get a result of y = 0, this means that x = 2 is indeed a root or zero of y=-x^3+7x^2-55x+90\r
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\n" ); document.write( "\n" ); document.write( "Let me know if you need more help or if you need me to explain a step in more detail.
\n" ); document.write( "Feel free to email me at jim_thompson5910@hotmail.com
\n" ); document.write( "or you can visit my website here: http://www.freewebs.com/jimthompson5910/home.html\r
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\n" ); document.write( "\n" ); document.write( "Thanks,\r
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\n" ); document.write( "\n" ); document.write( "Jim \n" ); document.write( "
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