Question

Daca {3^a,9^b-a,9^b}={3^a-2,3^4-b,3^a+b} unde a,b €N* atunci a+b=?

Answer 1

9^b-a=3^4-b
3^2(b-a)=3^4-b
2(b-a)=4-b
9^b=3^a+b
3^2b=3^a+b
2b=a+b
a=2b-b
a=b
2(b-b)=4-b
4-b=0
b=4
a=4
a+b=8