Bias is when you show prejudice or favoritism towards something for example:My bias kpop artists are bts. lol (luv em...anyways) that is how u would use that in a sentence
it can and also cant be, if you're bias you strong strong favoritism. like if I was supposed to do a piece on the election, and im a republican if all I did was talk about how great trump is over Hilary (I don't like either actually) that would be a biased piece, depending on what type of piece the need you can really use a bias or an un biased opinion. For the best piece id go for unbiased unless you want to put yourself in there.
Brutus justifies the assassination by claiming that he killed Caesar for the good of the people of Rome. He also sates that he loved Caesar but he slew him because of his ambition for power.