Respuesta :
if y+4 = 0 or y=-4 we have division by 0 and therefore
y=-4 is excluded
excluded value is x = - 4
The denominator of the rational expression cannot be zero as this would make the fraction undefined. Equating the denominator to zero and solving gives the value that y cannot be.
solve y + 4 = 0 ⇒ y = - 4 ← excluded value
