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possible rational roots for 2x^3+5^2-8x-2=0

Sagot :

Answer:

Step-by-step explanation:

f(x)=2x³+5x²-8x-2

     +     +     -     -

there is only one change of sign.

Hence it has only one positive rational root.

f(-x)=-2x³+2x^2+8x-2

       -       +        +   -

it has two negative rational roots.

or  two negative irrational roots.

∵irrational roots always occur in pairs.

possible rational roots are 1 or 3

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