If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
200 = (-1/6)*x^2+100*x // - (-1/6)*x^2+100*x
200-((-1/6)*x^2)-(100*x) = 0
(1/6)*x^2-100*x+200 = 0
1/6*x^2-100*x+200 = 0
DELTA = (-100)^2-(1/6*4*200)
DELTA = 29600/3
DELTA > 0
x = ((29600/3)^(1/2)+100)/(1/6*2) or x = (100-(29600/3)^(1/2))/(1/6*2)
x = 3*((29600/3)^(1/2)+100) or x = 3*(100-(29600/3)^(1/2))
x in { 3*(100-(29600/3)^(1/2)), 3*((29600/3)^(1/2)+100) }
| 30=-10t+60 | | h(t)=-5t^2+10t+4 | | ax+by=c-x | | 41/5x-31/8=3329/440 | | 6=2v+20 | | -8+x/4=-9 | | 1.5x-8=4x-12 | | -3(2x+5)+4=17 | | 2.8=2h | | ax-x=cWhatisX | | 7u=210 | | m^3+343=0 | | 7+(25-10)-8= | | 4^5x^9/4^6x^8 | | (x)=1/3(5-4x) | | x-21=-17 | | 18x=4x+98 | | -28=7b-14 | | 10-3k=-5 | | 3=x-2/2 | | x^4+x^9= | | 7(x+2)+2x=32 | | 5h-6p=4w^2 | | 3(4k+4)=0 | | y-2x+6= | | 15M-9=180 | | 4000lbs=tons | | 23t-7= | | x/-2x^4 | | -37-7v=-24+48 | | a/20+14/15 | | 38=6(x+4)-8x |