William Elliot wrote: > On Mon, 28 Apr 2014, Peter Percival wrote: >> punisher wrote: >> >>> Find the largest values of the integer a for which ax^2-5x-3 is >>> negative for all values of x. > >> Minus three. > > ax^2 - 5x - 3 > (5 +- sqr(25 + 12a)/2a > 25 + 12a < 0; a < -25/12
At this point one concludes that -3 is the answer.
-- ...if someone seduced my daughter it would be damaging and horrifying but not fatal. She would recover, marry and have lots of children... On the other hand, if some elderly, or not so elderly, schoolmaster seduced one of my sons and taught him to be a homosexual, he would ruin him for life. That is the fundamental distinction. -- Lord Longford