SOLUTION: find all rational zeroes of the polynomial y=3x^3+18x^2-21x-180

Question 724351: find all rational zeroes of the polynomial y=3x^3+18x^2-21x-180
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
find all rational zeroes of the polynomial y=3x^3+18x^2-21x-180
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use rational roots theorem to solve:
...0..|.....3......18......-21......-180......
...1..|.....3......21........0........-180
...2..|.....3......24.......27.......-126
...3..|.....3......27.......60.........0
y=(x-3)(3x^2+27x+60)
y=(x-3)(3x+12)(x+5)
zeros: -5, -4, 3
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