Question 1038402
We CANNOT divide by zero. Something like 8/0 is undefined. 
Think of a house built upon a foundation of nothing. It would collapse. 
That's how I remember that 0 cannot be in the denominator.


So because 0 can't be in the denominator, this means x+2 cannot be zero.


If x+2 were zero, then solving x+2 = 0 for x gives x = -2


This means if x = -2 then x+2 is zero.


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If x = -2, then the rational expression is undefined because this leads to a division by zero error. Any other real number is allowed for x.