find all the rational zeros of f(x)= 4x^3-3x^2-22x-15?

Question

a. ±5/2 ±1 ±3
b. -1,3, -5/4
c. -1,3
d. -5, -1, 3

Answer 1

f(x) = 4x^3-3x^2-22x-15 = (4x + 5)(x + 1)(x - 3)

The answer is b.

Answer 2

all you have to do is try to factor out the function, or if you don't know how to do that, then put the values in a,b,c,d and if they equal zero then you have your answer.