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Question

Find the interval of c for which f(x) =(x²+2x+c)/(x²+4x+c) attains any real value

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Solution

We found a similar question to the one that you posted. Please check it out here.

similarly find the values of c
Here we want to get real values for f(x)
so numerator and denominator of f(x) must be real
so find it in the above way
please try to understand

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