Prime Or Composite - Proof required?

[johnny009]

n^2 - 14n + 40, is this quadratic composite or prime - when n ≤ 0.

Determine, all integer values of 'n' - for which n^2 - 14n + 40 is prime?

Proof Required.

ps. I can do the workings, but the 'proof' is the problem.

Many Thanks

John.

 

[Greg]

Please continue the thread found http://mathhelpboards.com/discrete-mathematics-set-theory-logic-15/proof-amp-structures-22713.html.

Thread closed.