How i can graph in 3 dimension, dependent of the temperature?

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Good day for everyone, i have a simple question. I have matlab R2019a. My question is..
How i can graph this equation:
T = - 3 (x^2+y^2+z^2)^(1/2) + 300
is a room that is dependent of temperature in all directions
I tried this, but doesn't appear the graph
syms x y z
T0 = 300
f = -3*sqrt((x^2+y^2+z^2))+ T0;
fimplicit3(f, [0 0 0])
Thank you so much for your valious time.

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