If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-x2-6x+8=0
We add all the numbers together, and all the variables
-1x^2-6x+8=0
a = -1; b = -6; c = +8;
Δ = b2-4ac
Δ = -62-4·(-1)·8
Δ = 68
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{68}=\sqrt{4*17}=\sqrt{4}*\sqrt{17}=2\sqrt{17}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-2\sqrt{17}}{2*-1}=\frac{6-2\sqrt{17}}{-2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+2\sqrt{17}}{2*-1}=\frac{6+2\sqrt{17}}{-2} $
| 12.5n=5 | | x(0.68)=1 | | 12+2x+2=10x-2 | | 2x-9+x-5=13 | | x2-3x+10=0 | | 10x+40=140 | | a2-5a+8=0 | | 2(2x-2)=2 | | .75=2÷v-2 | | -10x+5=-6-35 | | 1/2x+2+x=32 | | 5r-13-6r=39r+50-16 | | y/7+4=-17 | | (9x^2)−6x=−1 | | 9x2−6x=−1 | | 4×m=360 | | -10=-7x+5(x+2) | | 5x-2x+5=6 | | 26=-3w+8(w-3) | | 1/2(3)^x=1/162 | | 2n-3n+9=-4n | | 4p^2-3p+1=p+p^2+1 | | q+9q=-120 | | -4v+7(v+3)=33 | | -6-r=2+3r | | 3p^2-2p=0 | | 6y+22=3y-41 | | -8+3+4n=-3 | | 12-6x=-3x+9x | | 15=-9+12x | | 2x^+11x-21=0 | | y=3(3)+-5 |