Find the points on the curve  which are nearest to the point (

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsLong Answer Type

291.

Find the area of greatest rectangle which can be inscribed in a circle of radius 10 cm.

73 Views

 Multiple Choice QuestionsShort Answer Type

292.

Find a point on the curve y2 = 4 x, which is nearest to the point (2, 1).

74 Views

 Multiple Choice QuestionsLong Answer Type

293.

Find the point on the curve y2 = 2x which is nearest to the point (1, – 4).

79 Views

 Multiple Choice QuestionsShort Answer Type

294.

Find the point on the curve y2 = 2x which is nearest to the point (1,  4).

81 Views

Advertisement
295.

Find the point on the curve x2 = 8y which is nearest to the point (2, 4).

245 Views

296.

Find the point on the curve x2 = 4y which is nearest to the point (–1, 2).

161 Views

 Multiple Choice QuestionsLong Answer Type

297.

Find the points on the curve 1 over straight x squared plus 1 over straight y squared space equals 1 comma space which are nearest from the origin. 

74 Views

Advertisement

298.

Find the points on the curve straight y equals straight x squared over 4 which are nearest to the point (0, 5).


Let (x, y) be the point on straight y equals straight x squared over 4 which is nearest to the point (0, 5).
because space space space space left parenthesis straight x comma space straight y right parenthesis space lies space on space the space curve space straight y space equals space straight x squared over 4 space space space space rightwards double arrow space space space point space is space open parentheses straight x comma space straight x squared over 4 close parentheses
Let d be the distance between (0, 5) and open parentheses straight x comma space space straight x squared over 4 close parentheses
therefore space space space space straight d space equals space square root of left parenthesis straight x minus 0 right parenthesis squared plus open parentheses straight x squared over 4 minus 5 close parentheses squared end root space space space space space space space space space space space space space rightwards double arrow space space space space straight d squared space equals straight x squared plus open parentheses straight x squared over 4 minus 5 close parentheses squared
Put space straight d squared equals space straight D comma space space space space space therefore space space space straight D space equals space straight x squared plus open parentheses straight x squared over 4 minus 5 close parentheses squared
Now d is maximum or minimum when D is maximum or minimum.
                     dD over dx space equals 2 straight x plus 2 open parentheses straight x squared over 4 minus 5 close parentheses. space space space fraction numerator 2 straight x over denominator 4 end fraction equals space space 2 straight x plus straight x open parentheses straight x squared over 4 minus 5 close parentheses
dD over dx space equals space 0 space give space us space 2 straight x plus straight x open parentheses straight x squared over 4 minus 5 close parentheses space equals space 0 space space space space rightwards double arrow space space space space 8 straight x plus straight x cubed minus 20 straight x space equals space 0
therefore space space space space space straight x cubed minus 12 straight x space equals space 0 space space or space space space straight x left parenthesis straight x squared minus 12 right parenthesis space equals space 0 space space space space space space space rightwards double arrow space space straight x left parenthesis straight x minus square root of 12 right parenthesis thin space left parenthesis straight x plus square root of 12 right parenthesis space equals space 0
therefore space space space space space straight x equals space space 0 comma space space space space 2 square root of 3 comma space space minus 2 square root of 3
space space space space space space space space fraction numerator straight d squared straight D over denominator dx squared end fraction space equals space 2 plus straight x. fraction numerator 2 straight x over denominator 4 end fraction plus open parentheses straight x squared over 4 minus 5 close parentheses.1 space space equals 2 plus straight x squared over 2 plus straight x squared over 4 minus 5 space equals space fraction numerator 3 straight x squared over denominator 4 end fraction minus 3
At space straight x space equals space 0 comma space space space fraction numerator straight d squared straight D over denominator dx squared end fraction equals space 0 minus 3 space equals space minus 3 space less than space 0
therefore space space space space straight D space is space maximum space when space straight x space equals space 0
We space are space not space interested space in space this space case
At space straight x space equals space 2 square root of 3 comma space space fraction numerator straight d squared straight D over denominator dx squared end fraction space equals 3 over 4. space 12 space minus 3 space equals space 9 minus 3 space equals space 6 greater than 0
therefore space space space space space straight D space is space minimum space when space straight x space equals space 2 square root of 3 comma space space space straight y space equals space 12 over 4 space equals space 3
therefore space space space space space point space is space left parenthesis 2 square root of 3 comma space 3 right parenthesis
Again at straight x equals negative 2 square root of 3 comma space space fraction numerator straight d squared straight D over denominator dx squared end fraction space equals space 3 over 4.12 space minus space 3 space equals space 6 space greater than space 0
therefore space space space space straight D space is space minimum space when space straight x space equals 2 square root of 3 comma space space space straight y space equals space 12 over 4 space equals space 3 space space space space space space space rightwards double arrow space space space space points space is space left parenthesis negative 2 square root of 3 comma space 3 right parenthesis

73 Views

Advertisement
Advertisement
299.

A jet of an enemy is flying along the curve y = x2 + 2. A soldier is placed at the point (3, 2). What is the nearest distance between the soldier and the jet?

473 Views

 Multiple Choice QuestionsShort Answer Type

300.

Find the maximum profit that a company can make, if the profit function is given by p (x) = 41 + 24x – 18x2.

92 Views

Advertisement