Many numbers, when multiplied by 
, are less than 
. We can find an inequality for numbers 
that are sufficient.
Clearly,
is the desired inequality. We divide by 7 to find that 
determines working numbers.
Clearly,
Factor the polynomial by its greatest common monomial factor. 12kº – 30k4 =
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Let 
be the identity matrix. Then pick whatever matrix you like for 
.