Answer :
A.
(7^2)^x = 1
(49)^x = 1
thus x = 0
B.
(7^0)^x=1
(1)^x = 1
thus x can be any real number.
(7^2)^x = 1
(49)^x = 1
thus x = 0
B.
(7^0)^x=1
(1)^x = 1
thus x can be any real number.