Solve \(\displaystyle{3}{y}'+{6}{x}{y}={6}{e}^{{-{x}}}\) where \(\displaystyle{y}{\left({0}\right)}={1}\). I am trying

Addison Fuller

Addison Fuller

Answered question

2022-03-23

Solve 3y+6xy=6ex where y(0)=1.
I am trying to solve 3y+6xy=6ex where y(0)=1. This is a first-order linear equation. Dividing by 3 and multiplying by ex2, we have
ex2y+2xex2y=2ex2x.
Thus, we have ddx(ex2y)=2ex2x.
Now, we have ex2y=2ex2xdx.
How do I calculate this integral? The solution is supposedly y(x)=(2x+1)ex2.

Answer & Explanation

shvatismop1rj

shvatismop1rj

Beginner2022-03-24Added 10 answers

Answer:
Based on the reformulation of the given problem, we can proceed as follows in order to solve it:
Therefore,

3y+6xy=6ex2 y+2xy=2ex2   ex2y+2xex2y=2   (ex2y)=2   ex2y=2x+c   y(x)=2xex2+cex2

Jadyn Gentry

Jadyn Gentry

Beginner2022-03-25Added 12 answers

Step 1
The given solution was y(x)=(2x+1)ex2. Supposing this is indeed the solution, we have
3y=(12x2+6x6)ex2.
Step 2
Hence, 6xy=(12x26x)ex2.
Thus, we have 3y+6xy=6ex2, and indeed, the problem was misprinted. The problem should read "Solve 3y+6xy=6ex2."

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