heatwave3860 heatwave3860 28-12-2023 Mathematics contestada Which of the following could be the first step in solving the equation below ? 5ˣ= 21a. 1/5.5ˣ=1/5.21b. log5ˣ=21c. log 5ˣ=log 21d. 5√5ˣ=5√21