
Re: Help Needed in math
Posted:
Apr 29, 2014 6:29 PM


On Wednesday, April 30, 2014 12:07:11 AM UTC+2, Peter Percival wrote: > quasi wrote: > > > punisher wrote: > > >> > > >> Can someone help me solve this > > >> > > >> Find the largest values of the integer a for which ax^25x3 is > > >> negative for all values of x. > > > > > > Is it homework? > > > > > > I'll give a few hints: > > > > > > (1) Can the required value of a be positive? Can it be zero? > > > > > > (2) Can you find the vertex coordinates in terms of a? > > > > > > (3) As an alternative to (2), find the discriminant in > > > terms of a. How can it help? > > > > > > quasi > > > > A more general hint: if it's homework then there is a good chance that > > what was done most recently in the classroom or read most recently in > > the textbook will be relevant. So if one is stumped by a homework > > question look first at what was (supposed to be) most recently learned. > > > > (Mind you, if I were a teacher I'd always throw in a few homework > > questions relevant to what I taught six months previously...) > > > >  > > ...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
An exellent advice!

