Asked by Dog_Lover
Identify a cubic polynomial with integer coefficients that has 2^(1/3) + 4^(1/3) as a root.
I tried solving it but my polynomial ended up having non-integer coefficients. I just can't think of a way to find it so that my polynomial has integer coefficients. Help, please!
I tried solving it but my polynomial ended up having non-integer coefficients. I just can't think of a way to find it so that my polynomial has integer coefficients. Help, please!
Answers
Answered by
oobleck
recall that 2+4 = (∛2^3 + ∛4^3) = (∛2 + ∛4)(∛4 - ∛8 + ∛16)
See what you can do with that. You might try using perfect cubes to see what's going on.
See what you can do with that. You might try using perfect cubes to see what's going on.
Answered by
Dog_Lover
Thanks for the reply.
I hadn't considered the idea of using perfect cubes. How would I use perfect cubes, though? I'm still confused.
I hadn't considered the idea of using perfect cubes. How would I use perfect cubes, though? I'm still confused.
Answered by
Dog_Lover
Never mind, I found an answer. Thanks for the help though!
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