So I have graphed it here: https://www.desmos.com/calculator/tz96dkf4x9
So since f(x)=0 at x=0 and x=4 (found using graph or quadratic formula where c=0)
We can guess that the function is positive after x=0
Using our graph we confirm that for every x greater than 0, f(x) is positive.
Let me know if you have any further questions!
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