document.write( "Question 1117032: Factorise x^4 - x^2 + 6x - 9. \n" ); document.write( "

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Factorise x^4 - x^2 + 6x - 9.
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document.write( " ------ Separating a TRINOMIAL that can be factored
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document.write( ", or 
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document.write( "Now, we can see that we have a DIFFERENCE of TWO SQUARES BINOMIAL, which gives us:
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document.write( "Correct answer:  \n" );
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