If it's not what You are looking for type in the equation solver your own equation and let us solve it.
9x^2-28x+4=0
a = 9; b = -28; c = +4;
Δ = b2-4ac
Δ = -282-4·9·4
Δ = 640
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{640}=\sqrt{64*10}=\sqrt{64}*\sqrt{10}=8\sqrt{10}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-28)-8\sqrt{10}}{2*9}=\frac{28-8\sqrt{10}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-28)+8\sqrt{10}}{2*9}=\frac{28+8\sqrt{10}}{18} $
| 2.5-3.5=8+4x-6 | | x+1100*0.04=1100 | | 6x2+5x-21=0 | | 1/3x=-x+8 | | 3(c-4)=8(c-9) | | 7=14-d | | 1/8x=126 | | 2c-6=-7 | | 37=-9t-8 | | 13(x)+18+22=18x-10 | | 8(c-15)=-40 | | 4/3a=a+6 | | 7/43=4/x | | 2r−4=6 | | 9m-25=-57+m | | -3(n+5)=18 | | 4x(x+2)+6=2(3x+8) | | 8x+61=180 | | 4x+19=6x | | 8r2+4r−3=0 | | 8x+61+29=180 | | –0.5(2n+4)+6=–9+4(2n+1) | | 2^3x^2=100 | | 2x+1+2x=0 | | 2^2x^2=100 | | 26x-6-14x+4=22x-6-10x+12 | | 8n+5=43 | | 7y-4=35-y | | 2x+16=52−2x | | -0.5x-10=200 | | 2(7x+28)=2(8x+16 | | 2^3x2=100 |