If it's not what You are looking for type in the equation solver your own equation and let us solve it.
X^2-4X-0.8=0
a = 1; b = -4; c = -0.8;
Δ = b2-4ac
Δ = -42-4·1·(-0.8)
Δ = 19.2
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-\sqrt{19.2}}{2*1}=\frac{4-\sqrt{19.2}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+\sqrt{19.2}}{2*1}=\frac{4+\sqrt{19.2}}{2} $
| 5z/9+7=-3 | | 3zz=4 | | 4^x-3.2^(x+3)+128=0 | | 40x-0.5=5x | | u/1.5u+8.0=3.5 | | 5x^2-40x-165=0 | | -10=-4h-6 | | 5x^2-40x+15=180 | | x/2+71/2=91/2 | | x/2+71/2=92/2 | | 2x+45=6x+15 | | 13y-14=1 | | 9=-0.4(y/3.3) | | (4+v)(5v-2)=0 | | 3-(2x+5)=5+x+2(4x | | M=3x-8 | | 3xx5=60 | | 3(2x+5)=4x+7-x+ | | 20.5x-15=12x+155 | | 5-3x=16-6x | | 6g+25=30 | | 4(w+3)=7w-9 | | C(x)=30.00-0.10x | | 2x-8=-7+x | | 50x-4-80x=12+10x-1-40x | | -x+4-5x=4+7x | | 18-3u=24 | | 5-x+7=12-x | | 3n–8=1.8 | | ((x+11)3)-3=51 | | 2(x+3)=5-2x | | c(30)=10.00+0.07(30) |