Math Is Fun Forum
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#26 2014-06-10 05:38:34
- anonimnystefy
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- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: What values of x make this expression a perfect cube?
I hope so. I cannot see any mistakes so far.
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.
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#27 2014-06-10 05:41:30
- Bob
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- Registered: 2010-06-20
- Posts: 10,643
Re: What values of x make this expression a perfect cube?
The (k^2-1) (2x+7)^2 = 63 puts an upper bound on x anyway.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
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#28 2014-06-10 05:43:53
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: What values of x make this expression a perfect cube?
That's true.
Have you seen my PM?
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.
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