Post a New Question

Math -Urgent!!!

posted by .

List all the possible rational zeros of

Please help me. I don't understand how to do this. Can someone show me please.

  • Math -Urgent!!! -

    If a polynomial f(x)=0 has rational roots, the numerator must be a factor of the constant term, and the denominator must be a factor of the highest-power coefficient.

    so, since you have f(x) = 3x^3-x^2+2x+2

    any rational roots must have a numerator which divides 2, and a denominator which divides 3. So, any rational root must be in the list

    ±1/1, ±2/1, ±1/3, ±2/3

    This comes from the fact that if you have (in this case) 3 roots (p,q,r) for

    f(x) = ax^3 + bx^2 + cx + d

    pqr = -d/a
    pq + pr + qr = c/a
    p + q + r = -b/a

Answer This Question

First Name:
School Subject:

Related Questions

More Related Questions

Post a New Question