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Rational roots..help with my math hw pleasee!! I dont understand it very well. I really need help :/?

List the possible rational roots of each equation. Then determine the rational roots.

1) 2x3-3x2-2x+3=0

2)x3+3x2-6x-8=0

3)x4+x2-2=0

4) Find the number of possible real zeros and the number of possible negative real zeros. Then determine the rational zeros.

f(x)=x4+x3-7x2-x+6

Just help me with ANYTHING you can, it doesnt matter if its just one question.'

Thanks! I really need help , Im bad in this topic.

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