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calculus help needed please :)?
1-Find the interval(s) where the following functions is increasing and interval(s) where the functions is decreasing
a)f(x)=2x^2 +x+1,
b) f(x) = x /(x+1)2
c) f(x) = x^2e^(−x)
2-Determine where the function is concave upward and where it is concave downward:
(a) f(x) = 3x^4 −6x^2 +x−8.
(b) f(x) = e^(x2−9).
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