Q.

3x + 4y – 7 = 0 is normal to 4x2  3y2 = 1 at the point

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a

(2, 1/4)

b

(–3, 4) 

c

(1, 1)

d

(5, –2)

answer is B.

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Detailed Solution

Given hyperbola 4x2-3y2=1 x214-y213=1 a2=14, b2=13 equation of normal at P(x1, y1)is a2xx1+b2yy1=a2+b2 x4x1+y3y1-712=0         Given normal 3x+4y-7=0       since  &  represents same line then 314x1=413y1=- 7- 712 12x1=12y1 =12 (x1, y1)=(1, 1)

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