Question

n la puterea a 7:n la puterea a 3=(-5)la puterea a 4

Answer 1

n⁷/n³=[-5]⁴
n⁴=[-5]⁴
n={-5,5};

Answer 2

$n^7:n^3=(-5)^4 \Leftrightarrow n^4=(-5)^4. \\ \\ Avem~n^4=(-5)^4=5^4 \Rightarrow n \in \{-5;5\}.$