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The shortest distance between the line y-x=1 and curve x=y^2 is?
Please give detailed answer and explanation
Thanks
let us take a point on line y - x = 1 : A ( t -1 , t ) and on curve x = y2 : B ( t2 , t )
AB = root [ ( t - t )2 + (t2 - t + 1)2 ] = t2 - t + 1
f(x) = t2 - t + 1 , f '' (x) = 2t - 1 . For min value f '' (x) = 0 ; 2t - 1 =0 ; t =1/2
f '' '' (x) = 2 > 0 therefore t=1/2 is point of local minima
thus shortest distance = (1/2)2 - (1/2) + 1 = 3/4 units
Any point on parabola, (k2,k)
Perpendicular distance formula:
D=(k-k2-1)/21/2
Differentiating and putting =0
1-2k=0
k=1/2
Therefore the point is (1/4, 1/2)
D=3/(321/2)
The answer 3/√(32) is correct. THANKS for the correct answer.
But sir can you just tell me how that perpendicular distance formula is used. I would be really grateful to you.
Thanx once again
Distance of any point(x1,y1) from a line ax+by+c is:
|ax1 + by1 + c|/(a2+b2)1/2
That is the formula. You can reply to this post if you want the derivation.
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