Question 476641
It depends on what's the NUM and what's the DEN.
Add some parentheses.
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{{{(12-3x^2)/(x^2-x-2)}}}
= {{{(3(4-x^2))/((x-2)*(x+1))}}}
= {{{(3(2-x)*(2+x))/((x-2)*(x+1))}}}
= {{{(-3(x-2)*(2+x))/((x-2)*(x+1))}}}
= {{{-3(2+x)/(x+1)}}}