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If y=x3x2x+6, find the values of x at th...

If y=x3x2x+6, find the values of x at the turning point.

A.

12,3

B.

13,12

C.

1,13

D.

1,13

Correct answer is C

At turning point, dydx=0.

Given x3x2x+6

dydx=3x22x1=0

3x23x+x1=0(3x+1)(x1)=0

x=13,1