3*x^2-6*x-9=0

Simple and best practice solution for 3*x^2-6*x-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 3*x^2-6*x-9=0 equation: 



3x^2-6x-9=0

a = 3; b = -6; c = -9;
Δ = b2-4ac
Δ = -62-4·3·(-9)
Δ = 144
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{144}=12$


$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-12}{2*3}=\frac{-6}{6}
=-1
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+12}{2*3}=\frac{18}{6}
=3
$

See similar equations:

| 4/k+9=-2/k-5 | | 6x+13=2x+33 | | 4400-400x=3000 | | 26+7x=166 | | 26+7x=446 | | 2^r=1/16 | | 2r=1/16 | | 5(6d+8)=10(2d+7) | | 3m(58+43)=4(62+57)=55 | | 3c+3=5c+9 | | 3+3.5g=11-0.5g | | K(x)=3x | | 85+20x=785 | | 6x–14x=–8+2+(–42) | | -9w-12+10w=-2+9 | | 85+20x=765 | | 2(6x–3)=3(5x–7) | | F(x)=3x^2+30x-65 | | -4n+5=2-n | | 2x+3(x-2)=4(1-5x)-8 | | (x^2)+2x-10=0 | | 4-2k=-8+k | | 3-2x+20=4x-20 | | (2x+20)3=(4x20) | | 5(3x-1)-4=7(4-2x)+5 | | 2(x-3)+7=5-(2-x) | | .08x=1200 | | 5+x*4=60 | | -3-2(x+2)=4x-7 | | 5x–4=–6 | | 6a-8=3a+4 | | C=3.14d24 |

Equations solver categories