r^2+18r+81=0

Simple and best practice solution for r^2+18r+81=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for r^2+18r+81=0 equation: 



r^2+18r+81=0

a = 1; b = 18; c = +81;
Δ = b2-4ac
Δ = 182-4·1·81
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$r=\frac{-b}{2a}=\frac{-18}{2}=-9$

See similar equations:

| 3x-4-9x=8 | | 10c-2=7c-11 | | 1/3x+15=27 | | x12=23 | | m/14=-9/15 | | y=-49+21/4 | | 40•3x•x=180 | | 20-t=-3t | | 15-t+8t=-73 | | 6-2(3y+1)-7y=-2y+4(2-1)+3 | | 18x-42=7x+13 | | 2-7x4=4 | | 39+2x=x | | 5x-7x+13=4x+37 | | r/2-30=-23 | | 45+2d=-3d | | 2/3y+6=2/3(y-9) | | 3a-6=-2a-4 | | -22(4+3y)=-2(5 | | 2x+13+3x-19=154 | | 2+10(x+2)=5+2x | | x+21=-3x+45 | | x=5=5-2x | | j/9-25=-21 | | k/12=60 | | 3+x+1=3 | | 4q-3q-15=-5 | | y−(−10)=−41y | | 5.3x-12=15.8 | | 93+5n=5(n=2)-7 | | 4q–3q–15=–5 | | 5.x+2x+7=3x-7 |

Equations solver categories