Thanks Mod

All is clear and thanks for links.

one question: for me generally is not difficult to factor out an expression, for instance : x^2 – 5x – 6 = (x – 6)(x + 1). the sum or difference must give -5 and times must give -6.

Ok, in our scenario we do not have a pair of factors for 7 and 11 because primes. At most we could use quadratic formula to figure out if I have positive solution zero or negative (2 solutions, one or no solution, accordingly), but this formula doesn't resolve our problem as in the first solution. Infact purple math says ""unfactorable over the integers"

So, in the end when we encounter something like 6x^2 + 11x - 7 what we have to think first ?? Can you have a suggest ??

Thanks Bunuel

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