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# finding the non-permissible values for this rational expression?

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$${k +3 \over 2(k -3)}$$ in my textbook, they got $$-{5 \over 2}$$ and 3 and i don't know how they got that?

Mar 15, 2018

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Remember that  we cant have any values that make a denominator  =  0

So.... k cannot   =3    because that makes the denominator 0

I don't know where they get  -5/2......this functiion is certainly defined at k  = -5/2

See the graph, here : https://www.desmos.com/calculator/hh4osmk1fc

I've substituted x for k, but the idea is still the same....

Mar 15, 2018