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Log(ln) Function + 2 Parameters + Greater


Hello,

i am having problem telling Mathematica to:

First Try,

Clear[x, f]
f[x_] := x (a + Log[x])^2

a > 0
Plot[f[x], {x, -5, 5}]

Second Try,

f[x_] := x (a + Log[x])^2

Plot[f[x], {x, -5, 5}] /.a-> a>0


What i want is to tell Mathematica to draw a Graph of f[x] when a>0

Thanks for the help.


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