differentiation

Question: If $f(x)={{x}^{3}}-10{{x}^{2}}+200x-10$, then

1) $f(x)$is decreasing in $]-\infty ,10]$ and increasing in $[10,\,\infty [$

2) $f(x)$is increasing in $]-\infty ,10]$ .and decreasing in $[10,\,\infty [$

3) $f(x)$is increasing throughout real line

4) $f(x)$is decreasing throughout real line

Solution:

Explanation: No Explanation

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