Hello. In the description of the POW() function it says: ...For a negative base of type int or float and a non-integral exponent, a complex result is obtained. For example, pow(-9, 0.5) returns a value close to 3j. I guess I would have to say "a non-integer exponent" instead of "a non-integral exponent" Also in the Spanish version it says "no integral" Thank you and sorry if I'm wrong