Question

7 la puterea n ×7 la puterea n

Answer 1

7^n x 7^n = 7^(n + n) = 7^2n = (7²)^n = 49^n
nu stiu pana unde intelegi

Answer 2

7^n * 9^n + 21^(n+1) * 3^n - 9*63^n=
63^n+21^n * 21 * 3^n-9*63^n=
63^n+63^n * 21-9*63^n=
63^n(1+21-9)=
63^n *13


n:24 =c+16
n=24c+16
n=8(3c+2)  
=>  ndivizibil cu 8