that's okay, but the rational root test link shows you solved the equation using a solver which is not okay, had you not posted the link and only written "rational root test", I might not have figured it out, but since you did, it puts a wrong impression

it's okay to use a solver once you understand the method, but citing is not always necessary! (another lesson I learnt the hard way)

but another 200 sats for being honest and using formulas the correct way!