Question

Aflați numărul natural n dacă : 4^n+4^n+1+4^n+2=21.

Answer 1

.....................................

Answer 2

Răspuns:

4^n+4^n+1+4^n+2=21.

4^n+4^n+1+4^n+2=21

4^n+4^n×4^1+4^n×4^2=21

4^n×(1+4+16)=21

4^n×21=21

4^n=1

=》n = 0