If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-1.43x^2+7.64x+2.8=0
a = -1.43; b = 7.64; c = +2.8;
Δ = b2-4ac
Δ = 7.642-4·(-1.43)·2.8
Δ = 74.3856
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{-(7.64)-\sqrt{74.3856}}{2*-1.43}=\frac{-7.64-\sqrt{74.3856}}{-2.86} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7.64)+\sqrt{74.3856}}{2*-1.43}=\frac{-7.64+\sqrt{74.3856}}{-2.86} $
| 33+6x=(-1+5x | | (8x+5)=(3x+8)=90 | | (8x+5)=(3x+8)=180 | | 4p=-2p-6/10 | | (7x+25)+(x+9)=90 | | (7x+25)+(x+9)=180 | | 414-x=1785 | | (2r+4)+(r+5)=90 | | 2x+12=5x−3 | | (2r+4)+(r+5)=190 | | 20•y=300 | | x/6(x+6)=24 | | (2r+4)+(r+5)=180 | | 6.3x=9.2 | | 0.12x+(16-0.2x)=12 | | Z+90+z=180 | | 2x+(4x-2)+2(x+7)=4(2.5x) | | 1/3(6x+3)=5 | | 4+n/3=-23 | | -2.5x+1.5=3.5x-10.5 | | f=10+–3 | | -8r-4=-84 | | (x+3)^(2)=49 | | 11x14=19 | | (-8/2-3x/2)=11 | | =3(4x-9)+-2x-8 | | 54m=108 | | 4.25w=68 | | 6x1=34-5x | | 2x+92=3x+63 | | 51+(-17)=-3x+x | | 3–q=34+32q |