If a binomial

is a factor of a polynomial, then

is a root of this polynomial.
The answer is −3.555555555555556 but you can just put -3.55
12x3+27x2+23x+10/ 4x+5
3x2 + 3x + 2
The first question is 2, 12, and 14 but i’m sorry i don’t know the second :(