Answer:
-2x^2-8x+12 if you meant the second function to be g(x)=5x^2+6x-8
If you didn't mean that please let me know in the comments so I can change my answer
Explanation:
f-g=
3x^2-2x+4
-(5x^2+6x-8)
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-2x^2-8x+12
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