If it's not what You are looking for type in the equation solver your own equation and let us solve it.
120n-0.4n^2-2000=0
a = -0.4; b = 120; c = -2000;
Δ = b2-4ac
Δ = 1202-4·(-0.4)·(-2000)
Δ = 11200
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{11200}=\sqrt{1600*7}=\sqrt{1600}*\sqrt{7}=40\sqrt{7}$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(120)-40\sqrt{7}}{2*-0.4}=\frac{-120-40\sqrt{7}}{-0.8} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(120)+40\sqrt{7}}{2*-0.4}=\frac{-120+40\sqrt{7}}{-0.8} $
| X/10+x/5=20 | | 2n2−64=0 | | 2v2+96=0 | | x/2+x+4/8=x+1/4-8 | | 12x+6X-2=24 | | 4(1,8x-1)=3(2,4+1) | | x2+x+48=x+14-8 | | 16x-11=7x+10 | | -11/12x=11/8 | | (X-5)^2+(y-2)^2-25=0 | | 30/38=15/n=n | | 8w=91 | | 20+2y=36-8y | | 2(x+10)+13=3x+20 | | 2(x–10)=3(x–6)–2 | | X/x/3+1/2=x/6-5/12 | | 3w=−24 | | x=-53/617 | | 53=-617x | | 6–2(x–1)=0 | | (m)/(3)-7=-10 | | x2=7x= | | 9x-1=2x+1 | | 0.7y-1.6=2.1y+1.2 | | 1/3(2y+1)+1/2y=2/5(1-2y)-4 | | 6x2+6/2+1=25 | | 12+h=36 | | x=30+0.2x | | 5.5-x=4.2 | | y-14=4.2 | | 3m/m-3=3/7 | | 3(2x-7)=20 |