The domain of a real function will be all the places where the denominator isn't zero and the radicand in the square root isn't negative.
So find the places where the denominator vanishes or the square root is of a negative number and exclude those places from the domain.
Answer:
d
Step-by-step explanation:
its D i think you did a mistake for the answer is
4x^2 - 28x + 28
hope this helps