If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-4x^2+6x+28=0
a = -4; b = 6; c = +28;
Δ = b2-4ac
Δ = 62-4·(-4)·28
Δ = 484
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{484}=22$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-22}{2*-4}=\frac{-28}{-8} =3+1/2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+22}{2*-4}=\frac{16}{-8} =-2 $
| |3f+0.5|=7 | | z/7=28 | | 23(t+6)=5(2t+11) | | |3f-0.5|=7 | | -5(-7x+4)=295 | | -5(-7d+4)=295 | | 2.4=t÷4.5 | | 3x – 7 = 17 | | 20–2d=10 | | 2.25-2(7.5-4h)= | | 6(10+3m)=6(m+10)+12 | | b+8/2=-10 | | -2x+11=-3x-2 | | f(-4)=196 | | x+(x+10)=200 | | 2w(w-15)=72 | | x+(x+10)=20 | | U^2+3u=10 | | 600/200m=100 | | 19=-4y-1 | | 4x-2=5x+33 | | 2/3(6x-12)=4(2x+3) | | 2(x–1)–3x=9 | | -(3/4)+p=1/2 | | -6-7k+20=-2 | | 5(y-8)=24-6y | | 6+x=42.50 | | -3(c-8)=-2(-3c-3 | | 4x–8–7x+2=12 | | d/18+22=3d/54+22 | | -7–7x=8 | | X^2=1.96x10^17 |