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Determining the values to make a function undefined.

For what values or range of values are the following functions undefined
a) f(x) = 1/x
b) g(x) = Square root of (x+2)(x-3) <br>c) h(x) = 5 / x^2-4x-45

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a) For the function F(x)=1/x ,when x equal zero the function is ...

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The values to make some functions undefined are determined.