a) (343/64)^(2x-4) = (49/16)^(2x) = ((7/4)^2)^(2x) = (7/4)^(4x) = ((7^4)/(4^4))^x = (2401/256)^x
(49/16)^(2x) = (7/4)^(4x) = 2401/256
(343/64)^(2x-4) = (2401/256)^x
b) 16^x 3 = 3^(2x) 4
16^x 3 = (3^2)^x 4
16^x 3 = 3^(2x) 4
48 = 12^x
4 = 12^x
x = 0.5
a) (343/64)^(2x-4) = (49/16)^(2x) = ((7/4)^2)^(2x) = (7/4)^(4x) = ((7^4)/(4^4))^x = (2401/256)^x
(49/16)^(2x) = (7/4)^(4x) = 2401/256
(343/64)^(2x-4) = (2401/256)^x
b) 16^x 3 = 3^(2x) 4
16^x 3 = (3^2)^x 4
16^x 3 = 3^(2x) 4
48 = 12^x
4 = 12^x
x = 0.5