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Answer:
[tex]g(x)=3x^3+12[/tex]
Step-by-step explanation:
To stretch f(x) by 3, you have the new function of the form [tex]g(x)=3f(x)[/tex]. Plugging in for f(x) gives [tex]g(x)=3(x^3+4)=3x^3+12[/tex]