Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
BITSAT 2016
Exam
BITSAT
Year
2016
Subject
Mathematics
Chapter
Application of Derivatives

BITSAT 2016 · Mathematics · Application of Derivatives

The curve y=x e^ x has minimum value equal to

The curve y=xexy=x e^{x} has minimum value equal to

Options

  1. A−1e-\frac{1}{\mathrm{e}}
  2. B1e\frac{1}{\mathrm{e}}
  3. C−e-\mathrm{e}
  4. De

Correct answer

A. −1e-\frac{1}{\mathrm{e}}

Step-by-step solution

Let y=xexy=x e^{x}. Differentiate both side w.r.t. 'x'. \Rightarrow dydx=ex+xex=ex(1+x)\frac{\mathrm{dy}}{\mathrm{dx}}=\mathrm{e}^{\mathrm{x}}+\mathrm{xe}^{\mathrm{x}}=\mathrm{e}^{\mathrm{x}}(1+\mathrm{x})Put dydx=0\frac{\mathrm{dy}}{\mathrm{dx}}=0⇒ex(1+x)=0⇒x=−1\begin{array}{l} \Rightarrow \mathrm{e}^{\mathrm{x}}(1+\mathrm{x})=0 \\ \Rightarrow \mathrm{x}=-1 \end{array}Now,Now,\frac{\mathrmd^{2} \mathrm{y}}{\mathrm{dx}^{2}}=\mathrm{e}^{\mathrm{x}}+\mathrm{e}^{\mathrm{x}}(1+\mathrm{x})=\mathrm{e}^{\mathrm{x}}(\mathrm{x}+2)\left(\frac{\mathrmd^{2} \mathrm{y}}{\mathrm{dx}^{2}}\right)_{(\mathrm{x}=-1)}=\frac{1}{\mathrm{e}}+0>0Hence,0>0 Hence,\mathrm{y}=\mathrm{xe}^{\mathrm{x}}isminimumfunctionandis minimum function and\mathrm{y}_{\min }=-\frac{1}{\mathrm{e}} \text{. }
Practice Application of Derivatives on Quantrex Academy →

More from Application of Derivatives

The maximum area of rectangle inscribed in a circle of diameter R is BITSAT 2024Consider the function f(x)=(|x-1|)/(x^2) , then f(x) is BITSAT 2024The maximum volume (in cu. units) of the cylinder which can be inscribed in a sphere of… BITSAT 2024If the angle made by the tangent at the point (x_0, y_0) on the curve x=12(t+ t t)… BITSAT 2024The altitude of a cone is 20 cm and its semivertical angle is 30^ ^ ∘ . If the… BITSAT 2024The point of inflexion for the curve y=(x-a)^n , where n is odd integer and n ≥ 3 is BITSAT 2024The population p(t) at time t of a certain mouse species satisfies the differential… BITSAT 2024The function f(x)= (1+x)-(2 x)/(2+x) is increasing on BITSAT 2023If f(x)= x, g(x)= 2 x, h(x)= 3 x and I(x)= x , then which of the following option is… BITSAT 2023The interval in which the function f(x)=(4 x^2+1)/(x) is decreasing is : BITSAT 2023The curve given by x+y=e^ x y has a tangent parallel to the Y-axis at the point BITSAT 2023The function f(x)= ^ -1 ( x+ x) is an increasing function in BITSAT 2023A running track of 440 ft is to be laid out enclosing a football field, the shape of… BITSAT 2022A spherical balloon is filled with 4500 π cubic meters of helium gas. If a leak in the… BITSAT 2022The points at which the tangent passes through the origin for the curve y=4 x^ 3 -2 x^ 5… BITSAT 2021If the radius of a sphere is measured as 9 cm with an error of 0.03 cm , then find the… BITSAT 2021 Full Application of Derivatives list Application of Derivatives JEE Maths PYQsJEE Mathematics PYQs All BITSAT PYQs