Here's the question you clicked on:
FeoNeo33
Suppose you divide a polynomial by a binomial. How do you know if the binomial is a factor of the polynomial? Create a sample problem that has a binomial which IS a factor of the polynomial being divided, and another problem that has a binomial which is NOT a factor of the polynomial being divided.
one way is by using the factor theorem if f(x) is divisible by (x-a) then f(a) = 0 an example would be x^3 - 2x^2 + 4x - 8 test to see if this is divisible by (x-2) f(2) = 2^3 - 2(2)^2 + 4(2) - 8 = 0 so by factor theorem it is a factor
lets see if x+3 is a factor of the above polynomial f(-3) = -3^3 -2(-3)^2 +4(-3) - 8 = -27 -18 - 12 - 8 = -65 so x+3 is not a factor by another theorem (the remainder theorem) remainder = -65 for the division The factor theorem is a special case of remainder theorem
Interesting, I see now. This is mine that I just came up with, 2x^4 - 9x^3 +21x^2 - 26x + 12 by 2x - 3.