# SOLUTION: What numbers cannot be used for x in each rational expression? a. (3x - 1)/(x^2 - 4) b. 8/(3 + 2x) c. 5/x Can someone please explain this to me, I do not understand

Algebra ->  -> SOLUTION: What numbers cannot be used for x in each rational expression? a. (3x - 1)/(x^2 - 4) b. 8/(3 + 2x) c. 5/x Can someone please explain this to me, I do not understand       Log On

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 Question 421125: What numbers cannot be used for x in each rational expression? a. (3x - 1)/(x^2 - 4) b. 8/(3 + 2x) c. 5/x Can someone please explain this to me, I do not understand how or why. THanks in advance!!!!!!Answer by stanbon(60776)   (Show Source): You can put this solution on YOUR website!What numbers cannot be used for x in each rational expression? The denominators cannot be zero. ---- a. (3x - 1)/(x^2 - 4) x^2-4 cannot be zero x cannot be 2 or -2 ------------------------------ b. 8/(3 + 2x) 3+2x cannot be zero x cannot be -3/2 ----------------------- c. 5/x x cannot be zero ======================== Cheers, Stan H. ============