please help, factorise: $\displaystyle y=x^2+18x+9$ thanks
Last edited by randomised; Oct 12th 2008 at 10:17 AM.
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Hello, Originally Posted by randomised please help, factorise: $\displaystyle y=x^2+18x+9$ thanks It cannot be factored in a nice form The discriminant is 18²-4*9=324-36=288 and sqrt(288)=12 sqrt(2)
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