You could try simplifying as follows...My time is pretty limited when I take tests and quizzes, and this problem seems like it would take too long for what its worth given my current knowledge.
i can get 36y^2+42y-30y-35 and do the rest from there. However I am wondering if theres a quicker way to figure this problem out. The way I get this is:
42*-30 = -1260
I dont know how im supposed to just know that or calculate that in a reasonable amount of time. so im wondering is there some trick to factoring trinomials like this in a faster, more efficient way? I typically use the grouping method. Hopefully my only options arent limited to pure trial and error.