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Q.

The maximum slope of the curve y=12x45x3+18x219x  occurs at the point

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a

2,9

b

0,0

c

3,212

d

2,2

answer is B.

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Detailed Solution

The given equation of the curve is y=12x45x3+18x219x

            Differentiate both sides

m=dydx=2x315x2+36x19

dmdx=6x230x+36=6x25x+6=6x2x3

If dmdx=0 

x2=0,x3=0

d2mdx2=62x5<0 for x=2

so the slope has maximum value at x=2, when x=2 then y=840+7238=2

Therefore, the point is 2,2

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