Answer: 2
Explanation:
f(x)=x^2+12
f(m)=m^2+12
3[f(m)]=3m^2+36----(1)
f(3m)=9m^2+12------(2)
It is Given that f(3m)=3[f(m)]
From (1) and(2)
3m^2+36=9m^2+12
m^2=4
m=2 or-2
But it's given that m>0
Thus m=2
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