Browsing Brazilian Portuguese translation

Translators: This phrase is spoken to inform the user that what is about to
be said is part of a mathematical root (square root, cube root, nth root).
It is primarily intended to be spoken when the index of the root is not a
simple expression. For instance, for the fourth root of 9, simply speaking
"fourth root of 9" may be sufficient for the user. But if the index is not
4, but instead the fraction x/4, beginning the phrase with "root start" can
help the user better understand that x/4 is the index of the root.