Thread:The North Face/@comment-33493166-20180504225819/@comment-33493166-20180509025526

(-20 +- sqrt(20^2 - 4*12*-8))/2*12

(-20 +- sqrt(400 + 384))/24

(-20 +- sqrt(784))/24

(-20 +- 28)/24

-48/24  -8/24

x = -2  x = -1/3

I think that's right... maybe... but if you want to find the x coordinate on a parabola where y= whatever, its actually very useful. Plus, its the basis for a whole lot of other more useful stuff that comes later on.