If it's not what You are looking for type in the equation solver your own equation and let us solve it.
X^2-40X+156=0
a = 1; b = -40; c = +156;
Δ = b2-4ac
Δ = -402-4·1·156
Δ = 976
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{976}=\sqrt{16*61}=\sqrt{16}*\sqrt{61}=4\sqrt{61}$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-40)-4\sqrt{61}}{2*1}=\frac{40-4\sqrt{61}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-40)+4\sqrt{61}}{2*1}=\frac{40+4\sqrt{61}}{2} $
| -3-x/2=-8 | | 4x-36=8x-7 | | (4/40)x^2-4x+15.6=0 | | 2x+(6-3x)=24 | | 1/2x=-44 | | -7x–5–7x=-3–14x–11 | | 180=93+3x+18 | | 8=5y−12 | | 13+3(5c-2)=29 | | 9(d+2)=72 | | 3(2x-8)=-4(-6+21) | | -3u-3-10=11 | | -10x+9=2–10x | | 21−2p=13 | | -10m+9=2–10m | | 4x-8+2x+1=180 | | 87=3(b+12) | | -40(x+1)=x-80 | | 22=g-7 | | 5x+6=3x-(-2x-6) | | 1/3x-1/6=1/3x-1 | | 17(s-20)=-17 | | 102.33=(1+r)(1-0.2)113.20 | | 2(5t+5)=10 | | 7.8=r(52) | | 2x+2(x-6)=80 | | -9t+10=10−9t | | 丨9+6x丨=4 | | 4^9-x=135 | | 163=(1-0.4)(1-r)340 | | -y/3+1/6=-1/2 | | 17.1=-m+8.2 |