Hi,

First post here, so bear with me if I'm breaking forum etiquette

I'm working out exercises in my Croft & Davis engineering mathematics book. I'm supposed to solve the equation :

dy/dt = 2x + 4t

By using an integrating factor. According to the book, the answer should be :

-2t -1 + ce^{2t}

While my answer is just -2t + ce^{2t}. What am I doing wrong? And where does the -1 come from?

Thank you!

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