Răspuns :
7ˣ + 7ˣ⁺² =
7ˣ * (1+7²)=
7ˣ * 50=2 450
=> 7ˣ = 49
=> x=2
verificare:7²+7⁴=7² * 50=49*50=2 450
7ˣ * (1+7²)=
7ˣ * 50=2 450
=> 7ˣ = 49
=> x=2
verificare:7²+7⁴=7² * 50=49*50=2 450