Name the real numbers that must be excluded from the domain of:?

Question

x^2 + 3
----------------------
4x (2x - 1)(x + 7)

Answer 1

At x = 0 ; x = 1/2 and x = -7 the denominator becomes 0.
The fraction becomes undefined as divide by zero is not possible,

so x = (0,1/2,-7) should be excluded from the domain.

Answer 2

X= 0,1/2 and -7 because at those points the denominator is zero