Here's the question you clicked on:
swissgirl
\(\large \color{ Blue }{\frac{d^2y}{dx^2}+5 \left( \frac{dy}{dx}\right)^3-4y=e^x\)
\[\large \color{blue}{\frac{d^2y}{dx^2}+5 \left( \frac{dy}{dx}\right)^3-4y=e^x}\]
You forgot to add '}' in the most end.
\(\large \color{ Blue }{\frac{d^2y}{dx^2}+5 \left( \frac{dy}{dx}\right)^3-4y=e^x}\) hmmmm it works here but not on my program :(
I just reset the page and it worked now. Its some stupid app that misbehaves
\large \color{blue}{\frac{d^2y}{dx^2}+5 \left( \frac{dy}{dx}\right)^3-4y=e^x}