If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-5x^2+168x-840=0
a = -5; b = 168; c = -840;
Δ = b2-4ac
Δ = 1682-4·(-5)·(-840)
Δ = 11424
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{11424}=\sqrt{16*714}=\sqrt{16}*\sqrt{714}=4\sqrt{714}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(168)-4\sqrt{714}}{2*-5}=\frac{-168-4\sqrt{714}}{-10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(168)+4\sqrt{714}}{2*-5}=\frac{-168+4\sqrt{714}}{-10} $
| 1/4(c)=2 | | 4x-18=7x-57 | | 35.5-4.25(x)=24.25-5.5(x) | | (x-2)(x-7)=-20 | | 6^4=(6^2)^x | | 2i—8=12 | | 10y+3=-23 | | 3x=8x-55 | | 8x-51=7x-41 | | 6x-98+2x-18=180 | | 6x-92+3x+56=180 | | 0.23(10,000)-0.05y=(y+10,000) | | 0.23(10,000)-0.05y=(y+1000) | | 0.23(10,000)-0.05y=(y+10000) | | 7x-95=6x-78 | | x+9-x-9=72 | | 21y+3(90-13y)=180 | | x2+9-x2-9=72 | | x+35+4x=90 | | 21y+3y=180 | | 77+53+b=180 | | 35+35+b=180 | | 118+33+b=180 | | 60+60+b=180 | | 4a/4=20/4 | | 37+63+b=180 | | 115y=900 | | 47+86+b=180 | | 36+72+b=180 | | -3x+40x-152=20 | | 120y=180 | | 5x-33+6x+3=180,X |