Question

Find the shortest distance between the line y – x = 1 and the curve x = y2.

Solution

Correct option is

Let P (t2t) be any point on the curve x = y2.

The distance of P from the given line is  

                       

Because t2 – t + 1 is a positive expression

We have to find minimum value of this expression.   

  

             

Distance is minimum for   

SIMILAR QUESTIONS

Q1

Identify the absolute extrema for the following function.  

                      f (x) = x2 on [–1, 2]

Q2

Identify the absolute extrema for the following function.  

                     f (x) = x3   or    [–2, 2]

Q3

Determine the absolute extrema for the following function and interval.

             g(t) = 2t3 + 3t2 – 12t + 4    on    [– 4, 2]  

Q4

Find the local maximum and local minimum values of the function y = xx.

Q5

A window is in the form of a rectangle surmounted by a semi-circle. The total area of window is fixed. What should be the ratio of the areas of the semi-circular part and the rectangular part so that the total perimeter is minimum?   

Q6

A box of constant volume C is to be twice as long as it is wide. The cost per unit area of the material on the top and four sides is three times the cost for bottom. What are the most economical dimensions of the box?  

Q7

Find the maximum surface area of a cylinder that can be inscribed in a given sphere of radius R 

Q8

Find the semi-vertical angle of the cone of maximum curved surface area that can be inscribed in a given sphere of radius R.

Q9

Find the point on the curve y = x2 which is closest to the point A(0, a).  

Q10

Find the vertical angle of right circular some of minimum curved surface that circumscribes in a given sphere.