
Re: Help Needed in math
Posted:
Apr 29, 2014 5:23 AM


On Mon, 28 Apr 2014, Peter Percival wrote: > punisher wrote: > > > Find the largest values of the integer a for which ax^25x3 is > > negative for all values of x. > Minus three.
ax^2  5x  3 (5 + sqr(25 + 12a)/2a 25 + 12a < 0; a < 25/12
ax^2  5x  3 < 25x^2 / 12  5x  3 < 0 ? 25x^2  60x  36 = (5x + 6)^2 <= 0

