45. log b sqrt 7x

46. log b sqrt (3/y)

Could someone please explain these?

45.

logb √(7x)
= logb (7x)^(1/2)
=(1/2 logb (7x)
= (1/2) ( logb 7 + logb x)

do #46 the same way,
except recall that log(A/B) = logA - logB