Q.

If the slope of the tangent to the curve is maximum at x = 1 and curve has minim value 1  at x = 0, then the curve which also satisfies the equation  d3ydx3=4x3 is
 

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a

y=1+x+x2+x3

b

none of these

c

y+2x+dydx=0

d

y=1+x22x32+x46

answer is B.

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Detailed Solution

we have  d3ydx3=4x3
 Integrating, we get   d2ydx2=2x23x+c
 Given slope of tangent to the curve is maximum at x = 1,

slope is dydx, to find slope max equate d2ydx2 to zero
 Then  d2ydx2x=1=0     23+c=0    c=1
d2ydx2=2x23x+1  
 Integrating we get 
dydx=2x333x22+x+D  
curve has a minimum value 1 at x = 0

to find y=f(x) minimum equate f'(x)=0 or dydx=0
dydxx=0=0              D=0  
dydx=2x333x22+x  
 Again integrating, we get   y=x46x32+x22+E
 Given minimum value of curve is 1 at x = 0
 Then 1 = 0 + E    E = 1
 Hence the curve is   y=1+x22x32+x46
 

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