what we have here is an “ugly” trinomial, it’s basically a normal trinomial but you have to do a little extra work because of the leading coefficient being greater than 1

since the leading coefficient can relate to the other two numbers in the equation (9 and 30) they can be reduced to 3 and 10 because of division leaving us with x4+3×2+10 so then what we did was we just took the lead coefficient out and left us with a simple trinomial to factor so once you factor the trinomial as I did there you are left with the 3 which you put on the left outside of the brackets. If the coefficient didn’t relate with the other 2 numbers it would go to the left but inside the bracket