Question

Calcule as potências em IR quando definidas:

Answer 1

$a) \\ 5^{ \frac{2}{7}} = \sqrt[7]{5^2} \\ \\ b)~~9^{ \frac{1}{2}} = \sqrt{9} =3 \\ \\ c)~~ -4^3=-64 \\ \\ d)~~(-7)^2=+49$