x^2-2x-3 / x^2+5x+4
x2+5x+4)= ((x2-3x+x-3)/ ( x2+4x+x+4)
The expression is undefined for x=-4 and x=-1
If x not equal to -1 then this becomes (x-3)/(x+4)
This is not valid for x= -4
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