English

At What Point on the Following Curve, is the Tangent Parallel to X-axis Y = X2 on [−2, 2] ? - Mathematics

Advertisements
Advertisements

Question

At what point  on the following curve, is the tangent parallel to x-axis y = x2 on [−2, 2]
?

Sum

Solution

Let \[f\left( x \right) = x^2\]

Since \[f\left( x \right)\] is a polynomial function, it is continuous on \[\left[ - 2, 2 \right]\] and differentiable on \[\left( - 2, 2 \right)\] .

Also, \[f\left( 2 \right) = f\left( - 2 \right) = 4\]
Thus, all the conditions of Rolle's theorem are satisfied.
Consequently, there exists at least one point c
\[\in \left( - 2, 2 \right)\] for which  \[f'\left( c \right) = 0\] .
But \[f'\left( c \right) = 0 \Rightarrow 2c = 0 \Rightarrow c = 0\]
\[\therefore f\left( c \right) = f\left( 0 \right) = 0\]
By the geometrical interpretation of Rolle's theorem, \[\left( 0, 0 \right)\] is the point on \[y = x^2\] , where the tangent is parallel to the x-axis.
shaalaa.com
  Is there an error in this question or solution?
Chapter 15: Mean Value Theorems - Exercise 15.1 [Page 9]

APPEARS IN

RD Sharma Mathematics [English] Class 12
Chapter 15 Mean Value Theorems
Exercise 15.1 | Q 8.1 | Page 9

RELATED QUESTIONS

Show that height of the cylinder of greatest volume which can be inscribed in a right circular cone of height h and semi vertical angle α is one-third that of the cone and the greatest volume of cylinder is `4/27 pih^3` tan2α.


f (x) = [x] for −1 ≤ x ≤ 1, where [x] denotes the greatest integer not exceeding x Discuss the applicability of Rolle's theorem for the following function on the indicated intervals ?


f (x) = x2/3 on [−1, 1] Discuss the applicability of Rolle's theorem for the following function on the indicated intervals ?


Verify Rolle's theorem for the following function on the indicated interval f(x) = x2 − 8x + 12 on [2, 6] ?


Verify Rolle's theorem for the following function on the indicated interval f(x) = x2 − 4x + 3 on [1, 3] ?


Verify Rolle's theorem for each of the following function on the indicated interval f (x) = cos 2 (x − π/4) on [0, π/2] ?


Verify Rolle's theorem for the following function on the indicated interval f(x) = cos 2x on [−π/4, π/4] ?


Verify Rolle's theorem for the following function on the indicated interval f(x) = ex sin x on [0, π] ?


Verify Rolle's theorem for the following function on the indicated interval f(x) = ecos x on [−π/2, π/2] ?


Verify Rolle's theorem for the following function on the indicated interval f (x) = \[{e^{1 - x}}^2\] on [−1, 1] ?


Verify Rolle's theorem for the following function on the indicated interval f(x) = sin x + cos x on [0, π/2] ?


Verify Rolle's theorem for the following function on the indicated interval f(x) = 4sin x on [0, π] ?


Verify Rolle's theorem for the following function on the indicated interval f(x) = sin x − sin 2x on [0, π]?


If f : [−5, 5] → is differentiable and if f' (x) doesnot vanish anywhere, then prove that f (−5) ± f (5) ?


It is given that the Rolle's theorem holds for the function f(x) = x3 + bx2 + cx, x  \[\in\] at the point x = \[\frac{4}{3}\] , Find the values of b and c ?


Verify Lagrange's mean value theorem for the following function on the indicated intervals. find a point 'c' in the indicated interval as stated by the Lagrange's mean value theorem f(x) = 2x2 − 3x + 1 on [1, 3] ?


Verify Lagrange's mean value theorem for the following function on the indicated intervals. find a point 'c' in the indicated interval as stated by the Lagrange's mean value theorem f(x) = x(x + 4)2 on [0, 4] ?


Find a point on the parabola y = (x − 4)2, where the tangent is parallel to the chord joining (4, 0) and (5, 1) ?


Find a point on the curve y = x2 + x, where the tangent is parallel to the chord joining (0, 0) and (1, 2) ?


Find a point on the parabola y = (x − 3)2, where the tangent is parallel to the chord joining (3, 0) and (4, 1) ?


Let C be a curve defined parametrically as \[x = a \cos^3 \theta, y = a \sin^3 \theta, 0 \leq \theta \leq \frac{\pi}{2}\] . Determine a point P on C, where the tangent to C is parallel to the chord joining the points (a, 0) and (0, a).


Using Lagrange's mean value theorem, prove that (b − a) sec2 a < tan b − tan a < (b − a) sec2 b
where 0 < a < b < \[\frac{\pi}{2}\] ?


If f (x) = Ax2 + Bx + C is such that f (a) = f (b), then write the value of c in Rolle's theorem ? 


State Rolle's theorem ?


State Lagrange's mean value theorem ?


If from Lagrange's mean value theorem, we have \[f' \left( x_1 \right) = \frac{f' \left( b \right) - f \left( a \right)}{b - a}, \text { then }\]

 


Rolle's theorem is applicable in case of ϕ (x) = asin x, a > a in


The value of c in Rolle's theorem when
f (x) = 2x3 − 5x2 − 4x + 3, x ∈ [1/3, 3] is

 


The value of c in Rolle's theorem for the function f (x) = x3 − 3x in the interval [0,\[\sqrt{3}\]] is 

 


Show that height of the cylinder of greatest volume which can be inscribed in a right circular cone of height h and semi-vertical angle α is one-third that of the cone and the greatest volume of the cylinder is `(4)/(27) pi"h"^3 tan^2 α`.


Find the area of greatest rectangle that can be inscribed in an ellipse `x^2/"a"^2 + y^2/"b"^2` = 1


Find the difference between the greatest and least values of the function f(x) = sin2x – x, on `[- pi/2, pi/2]`


The values of a for which y = x2 + ax + 25 touches the axis of x are ______.


If f(x) = `1/(4x^2 + 2x + 1)`, then its maximum value is ______.


The maximum value of sinx + cosx is ______.


If the graph of a differentiable function y = f (x) meets the lines y = – 1 and y = 1, then the graph ____________.


The minimum value of `1/x log x` in the interval `[2, oo]` is


Let y = `f(x)` be the equation of a curve. Then the equation of tangent at (xo, yo) is :- 


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×