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
2y dydx = (2−x)2−2x(2−x), so dydx (1, 1) = −12Therefore, the equation of tangent at (1, 1) is y−1=−12(x−1)⇒ y=−x+32The intersection of the tangent and the curve is given by(1/4)(−x+3)2=x4+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=942−942=964. Thus the required point is (9/4, 3/8)