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4) Aflati X daca : 5 la puterea x + 5 la puterea x + 1 = 750

Răspuns :

5^x+ 5^x+1=750
5ˣ +5ˣ⁺¹ =750
5ˣ +5ˣ *5= 750
5ˣ(1+5)=750
5ˣ * 6= 6* 125 |÷6
5ˣ=125
5ˣ=5³
x=3