If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x2-2x-20=0
We add all the numbers together, and all the variables
x^2-2x-20=0
a = 1; b = -2; c = -20;
Δ = b2-4ac
Δ = -22-4·1·(-20)
Δ = 84
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{84}=\sqrt{4*21}=\sqrt{4}*\sqrt{21}=2\sqrt{21}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2\sqrt{21}}{2*1}=\frac{2-2\sqrt{21}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2\sqrt{21}}{2*1}=\frac{2+2\sqrt{21}}{2} $
| Y=x*2+1 | | Y=x×2+1 | | 2x+18-1=33= | | 6n+3=4n+7 | | 5*x-3=2x+15 | | 11/z/16+7z/8=5/16 | | -119=-7v+7 | | -2x/3+6=16 | | 7x−14=10 | | -4x/3+6=-2 | | 4x+12=x–6 | | (15/100)=(x/24) | | 4n+18=6n-40 | | n/11=5/8 | | x+x+(x/2)+(x/4)+1=100 | | 4/3=y/7 | | 37/10=18/5n-19/5n | | -24=-u/6 | | 2x^2+39=18x | | 9n+50=3(-11+9n)-7 | | 25x+7=9 | | 11=12-p | | 12-4a=-5a+3a | | 8/15=x/9 | | x+4/3-8=10 | | 4y=(y-1)+(2+y) | | Y+16y=18 | | 3+1÷3z=30 | | 10x-180=0 | | X+x^2+600=0 | | -0.004x1.32=1.08 | | 1x+x^2+600=0 |