helping solving sum and product of roots
1.what is the sum of the roots of the equation ax^2 + bx + c = 0
what is the product of its roots
2. solve the equation x^3 + 2x^2 + x + 2= 0, if -2 is a root
3. given the equation x^3 - 2x^2 + x - 3 + 0, what are the possible rational roots. Please help solve.
A big thanks