Question

HOW DO YOU DO THIS????????

Answer 1

The rational root theorem tells you all roots are of the form
  ±(factor of 2)/(factor of 3)
We know one of the roots is -1 and all roots are negative, so the remaining roots must be of the form
  -(factor of 2)/(factor of 3)
which is to say, two of
  -1/3, -2/3, -1, -2
Since the roots are distinct, they must be -2 and -1/3. Then the factorization of the given polynomial is
  (x +1)(x +2)(3x +1)
which multiplies out to be
  3x³ +10x² +9x +2

a = 10
b = 9