If it's not what You are looking for type in the equation solver your own equation and let us solve it.
X^2-13X+128=0
a = 1; b = -13; c = +128;
Δ = b2-4ac
Δ = -132-4·1·128
Δ = -343
Delta is less than zero, so there is no solution for the equation
| X^2-13x+1280=0 | | x-((x)(0.2))=5.28 | | 52x+364=260 | | 3(x+2)^2=-18 | | (2x-1)-0.5(3x-1)=0.4 | | 180=42+2x+6 | | 2x-5=4x+7/2 | | 5/17=x+4 | | 42+(2x+6)+90=180 | | 90+(2x+16)+30=180 | | 5m+2=4m-8 | | 8p-6=3 | | 26+(4x+19)+111=180 | | 3x-2/4-x=2/3 | | x-7+x-7+3x-23+3x-23=180 | | (v+3)^2=2v^2+10v-12 | | 3z+9/2=15 | | T(c)=2c+10 | | 8x-7(x+8)=2x-4 | | B=37-1.5t | | L=37-1.5t | | 3x+7x+15=0 | | 3b+36=0 | | 32x-3=14x-1 | | 3x+90=70+5x | | 40=x32 | | 15x+7=100 | | 4(3y+8)=-52 | | 8(t-5)+6t=7(2t+4)-10 | | 5e+10e-6e=-27 | | 13)-15=4m+5 | | 84-x=32 |