Solve this following

Question:

Mark $(\sqrt{)}$ against the correct answer in the following:

The function $f(x)=x^{3}+6 x^{2}+9 x+3$ is decreasing for

A. $1

B. $x>1$

C. $x<1$

D. $x<1$ or $x>3$

Solution:

But for $-1

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