# Integrating factor question

#### Sonal7

##### Full Member
I cant see the error. The option 2 is wrong when I click on it. Please see my working, I thought it would be the right answer

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#### Sonal7

##### Full Member
I got it how c isnt 0!!!

#### Subhotosh Khan

##### Super Moderator
Staff member
I got it how c isnt 0!!!
Your integration was incorrect. It should have been:

y * e2x = (1/2)*x * e2x - (1/4) * e2x + C

Now apply at x=0, we have y = 0 $$\displaystyle \to$$ C = 1/4

#### Sonal7

##### Full Member
Ah stupid mistake. I got it now. thanks a lot