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Q.

If the tangent at (1, 1) on  y2=  x(2x)2 meets the curve again at P, then  P is

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a

none of these

b

(-1,  2)

c

(4,    4)

d

(9/4,  3/8) 

answer is C.

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Detailed Solution

2y  dydx   =   (2x)22x(2x),  sodydx    (1,1)  =  12

Therefore, the equation of tangent at (1, 1) is 

y1=12(x1) y=x+32

The intersection of the tangent and the curve is given by

(1/4)(x+3)2=x4+x24xx26x+9=16x+4x316x24x317x2+22x9=0(x1)4x213x+9=0(x1)2(4x9)=0

 Since x=1 is already the point of  tangency, x_=9/4 and 

y2=942942=964Thus  the required point is (9/4,  3/8)

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