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Old 2017-02-14, 01:46   #2
science_man_88
 
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Jul 2009
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Quote:
Originally Posted by carpetpool View Post
Some examples for n = 3 (which don't have the simple form(s) (a^3-b^3)/(a-b) or (a^3+b^3)/(a+b))

19x^2+7x+1

37x^2+11x+1

.....

Which come from the discriminant D = b^2-4ac for ax^2+bx+c.
49-(4*19) = 49-76 = -27 not technically a power of three ( only in absolute value)
121-(4*37) = -27 again not technically a power of three ( it is a power of -3 though).
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