document.write( "Question 871368: I need help to factor this trinomial -x^2+7x+18 please explain step by step so I can do it myself :) \n" ); document.write( "

Algebra.Com's Answer #525485 by mananth(16946) $\"\"$ $\"About$

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$\"-x%5E2%2B7x%2B18\"$ \r
\n" ); document.write( "\n" ); document.write( "Multiply the first term and the third term\r
\n" ); document.write( "\n" ); document.write( "-18x^2\r
\n" ); document.write( "\n" ); document.write( "Split the middle term into two parts such that when you add the parts you get 7x and when you multiply them you get -18x^2\r
\n" ); document.write( "\n" ); document.write( "In this case the break up is 9 and- 2\r
\n" ); document.write( "\n" ); document.write( "9x-2x=7x\r
\n" ); document.write( "\n" ); document.write( "9x*-2x = -18x^2\r
\n" ); document.write( "\n" ); document.write( "Re write the trinomial\r
\n" ); document.write( "\n" ); document.write( " $\"-x%5E2%2B9x-2x%2B18\"$ \r
\n" ); document.write( "\n" ); document.write( "factorize\r
\n" ); document.write( "\n" ); document.write( "-x(x-9)-2(x-9)\r
\n" ); document.write( "\n" ); document.write( "(x-9)(-x-2)\r
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