9x2+8x-1=0

Simple and best practice solution for 9x2+8x-1=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 9x2+8x-1=0 equation: 



9x^2+8x-1=0

a = 9; b = 8; c = -1;
Δ = b2-4ac
Δ = 82-4·9·(-1)
Δ = 100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{100}=10$


$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-10}{2*9}=\frac{-18}{18}
=-1
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+10}{2*9}=\frac{2}{18}
=1/9
$

See similar equations:

| -48+6b=18 | | -r/2-8=16 | | 4m+5=65-4m | | −2w+5+5w=14 | | 3y+2Y+4y+6y=49 | | h-6=-24 | | 25-x15=15 | | 4=0.1x^2-0.7x | | 4x+2(x-3)=5(x-1)+x | | 142=4+3(6-8x) | | 5x+5=x10 | | M=-1,b=-3 | | 4x2+6x=70 | | 8x-5x-12=24 | | 10x+(9x+9)=180 | | +6x=70 | | 10x-3=10x+5 | | 1/2(a+2)=12 | | -4(2-5x)+6=-122 | | 2+3y+19y=999 | | -90=7(-2x-6)+2x | | f(7)=20+4(7) | | -4t+14=-9+24 | | M=0,b=4 | | 45+2x-10+3x+20=180 | | 14x+2=14x+2= | | 12m+30=210 | | 2.5(4x+10)=5(x-3) | | (2x-7)+(7x-3)=180 | | 6g+15=57 | | 24p+5=3p-1 | | 19=-5x+2-3x+1 |

Equations solver categories