Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Differential Equations

Question:

The general solution of differential equation \(\log_{e}\left(\frac{dy}{dx}\right)=2x-y,y(0)=0\) is

Options:

\(e^y=2e^{2x}+1\)

\(e^y=2e^{2x}+1\)

\(e^y=2e^{2x}+3\)

\(2e^{y}=e^{2x}+1\)

Correct Answer:

\(2e^{y}=e^{2x}+1\)

Explanation:

$\log\left(\frac{dy}{dx}\right)=2x-y$

so $\frac{dy}{dx}=\frac{e^{2x}}{e^y}⇒\int e^ydy=\int e^{2x}dx$

$e^y=\frac{e^{2x}}{2}+c$ at (0, 0)

$e^0=\frac{e^0}{2}+c⇒c=\frac{1}{2}$

$e^y=\frac{e^{2x}}{2}+\frac{1}{2}$

so $2e^y=e^{2x}+1$