(adsbygoogle = window.adsbygoogle || []).push({}); Mathematica: Why isn't this command with "Assuming" working?

I'm trying to execute the following command:

Assuming[g >= 0 && t >= 0, Refine[Abs[1 + I g t ]]]

I expect it to spit out

[tex]

\sqrt{1+t^2g^2},

[/tex]

but instead I'm just getting

[tex]

\text{Abs}[1 + i g t],

[/tex]

which is obviously pretty worthless. Does anyone see what I'm doing wrong?

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# Mathematica: Why isn't this command with Assuming working?

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