2x^2+21x+47=0

Simple and best practice solution for 2x^2+21x+47=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 2x^2+21x+47=0 equation: 



2x^2+21x+47=0

a = 2; b = 21; c = +47;
Δ = b2-4ac
Δ = 212-4·2·47
Δ = 65
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(21)-\sqrt{65}}{2*2}=\frac{-21-\sqrt{65}}{4}
$


$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(21)+\sqrt{65}}{2*2}=\frac{-21+\sqrt{65}}{4}
$

See similar equations:

| 5a=2a+6/7 | | 5=-(7/x-8) | | 5/7=k/13 | | 5x=-3×+2 | | -1-8y=-49 | | -10(1-9x)+6(x-20)=122 | | (x+3)/5-3=8 | | 4(-3x+1)=7x+3 | | 5x-2=3x12 | | 7x+0.27=10x | | -9k+8k=144 | | 5x–6=14 | | -15=y/4+5 | | -9/5x=1/6 | | 6u^2-5u-11=0 | | 5(2x+8)-3=(x+4) | | 2u=-3+5u | | 8k-3=-59 | | -5x+0.05=-x | | 1/2(1/8x+12)=4 | | 1/2(6x-4)+8-5=12 | | 4x^2+x-9=9x | | x=14=9 | | 24a+4624014=94724072 | | 4(x-1)=12x+12 | | u/3+2=-5 | | 3x-3.75=11.25 | | (5x+5)=(7x-11) | | 3/4x+1=5/6 | | 1+2/3=9+1/2y+1+3/4 | | 4x+16=6x+36 | | 10m=10-5(m-35) |

Equations solver categories