Find the inverse

Algebra Level pending

Consider\quad f:R{ + }→[4,∞)\quad given\quad by\quad f(x)=x^{ 2 }+4,\quad if\quad f\quad is\quad invertible\quad then\quad find\quad f^{ -1 },where\quad R{ + }\quad is\quad the\quad set\quad of\quad all\quad non-negative\quad real\quad numbers.

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