Question

Help, will medal

Answer 1

Last one is correct answer

because when we cant factorize it.

Answer 2

got it

Answer 3

If a polynomial is reducible that means it has roots and you can find whether polynomial has any root or not by looking it's delta(discrimination)
Delta=b^2-4ac (ax^2+bx+c in quadratic form.)
If delta <0 than polynomial hasn't any roots so it is irreducible.
11^2-4*2*24=-71<0
So polynomial is irreducible.