No. It is 9x, which is a monomial.
9x+3
(x + 4)(3x + 35)
(3x - y)(3x - 5y) and (2x + 1)(2x + 11)
x2+3x+8 is a trinomial But this quadratic equation will have no solutions because its discriminant is less than zero.
It is a quadratic expression and can be factored into: (3x+1)(x+2)
(3x+1)(x+2)
(3X + 9) (X + 9)
(5x - 4)(3x + 5)
(2x + 7)(x - 2)
(3x - 2)(2x + 6) or 2(3x - 2)(x + 3)
(5x - 4)(3x + 5)
(x + 8)(x - 5)