First we need to look at the change of signal of the function (it changes from √x to -√x).
This change of signal means the function was reflected over the x-axis.
Then, the value of -3 was added to the function.
An addition of -3 in the function means a translation of 3 units down.
So the transformations from m(x) to p(x) are:
A reflection over the x-axis followed by a translation of 3 units down.