SOLUTION: Find all the rational zeros of f(x)= 4x^3 - 3x^2 - 22x - 15

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Question 287852: Find all the rational zeros of f(x)= 4x^3 - 3x^2 - 22x - 15
Found 2 solutions by Alan3354, richwmiller:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
15 is
1*15 or 3*5
Try those first, plus and minus.

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
0 = (x-3)(x+1)(4 x+5)
so
x=3
x=-1
4x+5=0
4x=-5
x=-5/4