Question

5ⁿ +  5ⁿ⁺² = 650

3^n-1+5x3^n-1=162

Answer 1

3^n-1+5.3^n-1=162

3^n-1.(5+1)=162

3^n-1.6=162

3^n-1=162:6

3^n-1=27=3³

=>n-1=3

=>n=3+1

=>n=4

Answer 2

5ⁿ+5ⁿ⁺²=650

5ⁿ+5ⁿ.5²=650

5ⁿ.(5²+1)=650

5ⁿ.26=650

5ⁿ=650:26

5ⁿ=25=5²

=>n=2

Answer 3

a, n =4

b, n=2