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If f^(11)(x)lt0(gt0) on an interval (a,b...

If `f^(11)(x)lt0(gt0)` on an interval (a,b) then the curve y=f(x) on this interval is convex (concave) i.e it is below (above) any of its tangent lines If `f^(11)(x_(0))=0` or does not exist and the second derivative changes sign when passing through the point `x_(0)` then the point `(x_(0),f(x))` is the = point of inflection of the curve y=f(x)
`y=x^(4)+ax^(3)+(3)/(2)x^(2)+1` is concave along the entire number scale then

A

`|a||ge1`

B

`|a|le1`

C

`|a|le2`

D

`|a|gt2`

Text Solution

Verified by Experts

The correct Answer is:
C
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