3. Find all rational zeros of the function:

f(x)=25x^4+25x^3-154x^2-4x+24

got no ide how to do it.

4. Given that (1-i) is a zero of the function:

f(x)=4x^4-11x^3+14x^2-6x

Find all the zeros of the function.

Now for question 4 i got [x-(1-i)], [x-(1-i)] as conjugates now i factor them which gives x^2-2x+2, and now when i use long division ikeep getting -12x^2 as a remainder??????