If the tangent at (1,1) on y2=x(2−x)2 meets the curve again at p, then p is
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a
(4, 4)
b
(–1, 2)
c
(9/4, 3/8)
d
None of these
answer is C.
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Detailed Solution
2ydydx=(2−x)2−2x(2−x),so dydx|(1,1)=−12. Therefore , the equation of tangent at (1,1) is y−1=−12(x−1) ⇒ y=−x+32 The intersection of the tangent and the curve is given by (1/4)(−x+3)2=x(4+x2−4x) ⇒ x2−6x+9=16x+4x3−16x2 ⇒ 4x3−17x2+22x−9=0 ⇒ (x−1)(4x2−13x+9)=0 ⇒ (x−1)2(4x−9)=0 Since x=1 is already the point of tangency , x=9/4 and y2=94(2−94)2=964. Thus the required point is (9/4,3/8).