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 has minimum value equal to
Options
- A
- B
- C
- De
Correct answer
A.
Step-by-step solution
Let . Differentiate both side w.r.t. 'x'.
\Rightarrow Put \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}}+\mathrm{y}=\mathrm{xe}^{\mathrm{x}}\mathrm{y}_{\min }=-\frac{1}{\mathrm{e}} \text{. }