If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x2-7x+13=0
We add all the numbers together, and all the variables
x^2-7x+13=0
a = 1; b = -7; c = +13;
Δ = b2-4ac
Δ = -72-4·1·13
Δ = -3
Delta is less than zero, so there is no solution for the equation
| 12=3(v+1) | | 80+55x=120+35x | | 5x+3=2x-6 | | 6(4x-6)=252 | | 14x+-30=180 | | x–12=–4x–1 | | x+13=-58 | | 10x-4x=-9x | | 10n+60/n+5=0 | | 37=2x+14-4x+3 | | (9x-3)+(x-13)=10x+10 | | 3(1-9a)+22a=(2a-9)-15 | | 150-v=221 | | 75+-3.6f=-51 | | 6(4x-6)=253 | | 47+7x=28 | | 28+0.11m=20+0.16m | | 3(x+2)/4=15 | | 4=k-4/3 | | 4=j+3/3 | | 3x+15.5=6.2 | | 2x+3=-7x-33 | | 35n+60n=347.9 | | 4r=–4 | | m-7/8=3 | | 247=102-y | | 5x+(-2)=6x4 | | 7+x/27=1 | | n-2+2=8 | | -12=2(w-16) | | 20+x=65 | | 2x+7=11=2x |