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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

2ydydx=(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=x(4+x24x)

x26x+9=16x+4x316x2

4x317x2+22x9=0

(x1)(4x213x+9)=0

(x1)2(4x9)=0

Since x=1  is already the point of tangency , x=9/4  and y2=94(294)2=964.

Thus the required point is (9/4,3/8).         

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