# Extremal value problems: Problems with Solutions

Problem 1
Find the minimal value of the function $$f(x)=3x^3-9x^2+6$$ for $$x \in [-1;5]$$.
Problem 2
Find the maximum value of the function $$f(x)=x-5$$ if x is a number between -5 and 13.
Problem 3
Find the maximal value for the function $$f(x)=4sin(x)$$
Problem 4
Find the minimal value for the function $$f(x)=|x|-1$$.

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