document.write( "Question 98679: What numbers can not be used for X and Why? Can someone please explain what to do to solve this problem? thanks!\r
\n" ); document.write( "\n" ); document.write( "(X^2 - 4)/(9 - x^2) \n" ); document.write( "

Algebra.Com's Answer #71819 by 303795(602) $\"\"$ $\"About$

You can put this solution on YOUR website!
The bottom (or denominator) of the problem cannot be equal to zero as division by zero is undefined.
\n" ); document.write( "ie (9 - x^2)cannot equal zero.
\n" ); document.write( "Factorise (9 - x^2)
\n" ); document.write( "ie(3-x)(3+x) cannot equal zero.
\n" ); document.write( "So x cannot be equal to 3 and it cannot be equal to -3. \n" ); document.write( "

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