8r2+9r+2=0

Simple and best practice solution for 8r2+9r+2=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 8r2+9r+2=0 equation: 



8r^2+9r+2=0

a = 8; b = 9; c = +2;
Δ = b2-4ac
Δ = 92-4·8·2
Δ = 17
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(9)-\sqrt{17}}{2*8}=\frac{-9-\sqrt{17}}{16}
$


$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+\sqrt{17}}{2*8}=\frac{-9+\sqrt{17}}{16}
$

See similar equations:

| 3f-2=2 | | 37+67+2x+52=180 | | 36+v=-22 | | f|3-2=2 | | 2t2+2t-3=0 | | 1/2(80-y)+2y=82 | | -15+m=12 | | 14+6b+7−2b=1+5b | | 4(y×8=8(8×4) | | y=2500 | | -b+9=28 | | 9s2+s-1=0 | | 4(y×8)=8(8×=) | | 5s2-7s+3=0 | | 13-3x=-6 | | 5/4(10x-50)=5/8(16x-24) | | 4x=9+6x-31= | | 2u2-9u+9=0 | | 7*(8*6+42)-2=x | | 6-5x-(2x+3)=1 | | 2500=x | | 9|-9+r|=36 | | 5*x^-4=3x^+20 | | 4x-0.8=2.2 | | 2(y)=16 | | 5(y–7)=–5 | | 7^3x=7^15 | | 6z2+4z+9=0 | | 180=37+y | | x+x-41=80 | | 3f^2+7f-7=0 | | 20x-9=20x-9 |

Equations solver categories