How do you have factor y=6x²+24x-192 and find the zeros?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?