Finding Eigen Values: list of possible solution for Lambda

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zulfi100

Joined Jun 7, 2012
633
Hi,

I got a solution for finding eigen values. It evaluates to:

(Lambda)^3 -12(lambda) -16=0

After this it says that the list of possible integer solutions is:

+-1, +-2, +-4, _-8, +-16 (i.e. plus minus 1, plus minus 2 and so on).

I cant understand, why he says list of possible solution is this, when only lambda = 4 satisfies the eq.. Solution is attached.


Zulfi.
 

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