Question

solve

n² - 16ˣˣˣ⁺ᵅⁿⁱˣ= 0

Answer 1

Hard to read what you meant, but

n² - 16ˣˣˣ⁺ᵅⁿⁱˣ= 0
n² = 16ˣˣˣ⁺ᵅⁿⁱˣ
n = ±4ˣˣˣ⁺ᵅⁿⁱˣ

Fix your exponent and things should look better.