If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3x^2-21x-1=0
a = 3; b = -21; c = -1;
Δ = b2-4ac
Δ = -212-4·3·(-1)
Δ = 453
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{453}}{2*3}=\frac{21-\sqrt{453}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+\sqrt{453}}{2*3}=\frac{21+\sqrt{453}}{6} $
| (4x+2)=2x+4 | | 1(2x)=4•1/2(2x-8)+3 | | -(3x-42)+9x=6x+42 | | 15h-14h=12 | | k/3=-3 | | –8+5y=6y | | 4•1-3(x+2)=4•1/2(2x-8)+3 | | m-2=03 | | 7^8x7=x | | 6j+3/6=16 | | 14n+21=63 | | 2500+8s=5400 | | 4j+2(j+1.5)/6=16 | | 3/9x=30 | | 4(x+1)=5x+-2x+7 | | 180-42=3x+6 | | 3(1/3x+3)=21 | | x/4=1+x/3 | | -8m+8=-280 | | |3x+11|=18 | | 4(2x-1)=8(x+3) | | 4(x+1)=6x−2x+4 | | .5n;n=5 | | 17+3(5-2x)=44-2x | | (3x+21)+(6x-60)=180 | | 8x–3x=592 | | x-2/28=4 | | X²+1x-2x-2=180 | | -40-6m+1=7m-2 | | -190=5(3+7x) | | t/4-7=-3 | | 17p=-20+15p |