We have the following expression: 2 (5 ^ x) = 14 We must clear the value of x: (5 ^ x) = 14/2 (5 ^ x) = 7 We apply logarithm to both sides: log5 (5 ^ x) = log5 (7) By properties of logarithm we have: x = 1.21 Answer: the value of x in 2 (5 ^ x) = 14 is: c. 1.21