Question

Help ex 39 plssssssss​

Answer 1

5^n+2+3×5^n+1-5n=975

5^n×5²+3×5^n×5-5^n=975

5^n×25+3×5^n×5-5^n=975

5^n×(25+3×5-1)=975

5^n×(25+15-1)=975

5^n×39=975

5^n=975:39

5^n=25

n=2 deoarece 5²=25

bafta! :)