document.write( "Question 782829: How do you factorise equations like: x^2 -9 \n" ); document.write( "

Algebra.Com's Answer #476547 by jim_thompson5910(35256) $\"\"$ $\"About$

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Use the difference of squares rule a^2 - b^2 = (a-b)(a+b) to get \r
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\n" ); document.write( "\n" ); document.write( "x^2 -9 = x^2 - 3^2 = (x-3)(x+3) \n" ); document.write( "

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