2r2+9r+9=0

Simple and best practice solution for 2r2+9r+9=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 2r2+9r+9=0 equation: 



2r^2+9r+9=0

a = 2; b = 9; c = +9;
Δ = b2-4ac
Δ = 92-4·2·9
Δ = 9
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{9}=3$


$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(9)-3}{2*2}=\frac{-12}{4}
=-3
$


$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+3}{2*2}=\frac{-6}{4}
=-1+1/2
$

See similar equations:

| 9(8x+4)+3x=75x+41 | | 5u2+3u+1=0 | | -3=-6z-2-3 | | 4y-3=3y=1 | | x-1/1=1 | | 2(c+19)-3=15 | | 34+.50x=20+.75x | | 2x^2-10x+12=5 | | x5-x4-x12=0 | | 18=-y/32+20 | | 5/8=x2/5 | | 11=5x+10 | | 9p+4(2+0)=-18 | | 2x-6+4x+6=90 | | 2x-6+4x+6=180 | | 1=3(g−9)−-1 | | x*0.1=110 | | 2x+28+2x-20=180 | | 8b+b=10 | | 2x-2x+7=9 | | 69=(5x+7)+(8x-28) | | 2x-(4/3x)=120 | | 2=z+2-8z | | 12=11+w/5 | | 69=(5x+7)+8x-28) | | 2x-4/3x=120 | | 3(s-6)-1=8 | | w/7-1.6=-12.8 | | -7(2x-3)+5(3x-2)-3=9-8 | | 7(c+2=70 | | 2(a-3)+5a=8 | | 3(y+16)−-1=10 |

Equations solver categories