If it's not what You are looking for type in the equation solver your own equation and let us solve it.
5x^2-4x-9=0
a = 5; b = -4; c = -9;
Δ = b2-4ac
Δ = -42-4·5·(-9)
Δ = 196
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{196}=14$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-14}{2*5}=\frac{-10}{10} =-1 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+14}{2*5}=\frac{18}{10} =1+4/5 $
| x-9+x+66=x | | 7−9x=−29= | | 7x-9=28+4(x-1 | | 3x+-10=13 | | F=470(0.5y | | 2c−7=c | | x+.07=12000 | | 77-x=146 | | x+(x+15)=159 | | 20+25x=90+15x | | 3x=24=9 | | g=700(0.995Y | | 3x+10=2x50 | | -2x-0.75=3.25 | | 10y+-4y=-6 | | 6b-13=17 | | 1/4k=3(−1/4k+3 | | 12x-3x=7x+ | | 12x-3x=7x | | 7x-4x^{2}=0 | | u+35=46 | | u+35=496 | | (4y+11)(2y+19)=0 | | u+35=49 | | 8(2n+4)=8(8n+9)+4 | | 1=5(x-4)-2 | | 112y+25=-35 | | 5x+205=720 | | 8/u=3/7 | | 2x-11=x+47 | | -3(5t-3)+9t=7t-8 | | 8-6x-2=3+3x-15 |