If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-x+9x^2-4=0
We add all the numbers together, and all the variables
9x^2-1x-4=0
a = 9; b = -1; c = -4;
Δ = b2-4ac
Δ = -12-4·9·(-4)
Δ = 145
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{-(-1)-\sqrt{145}}{2*9}=\frac{1-\sqrt{145}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{145}}{2*9}=\frac{1+\sqrt{145}}{18} $
| -5-n=2(n+5) | | 0.25(3x-4)=2.75 | | 5g=-7g+72 | | 8x^2+8x-12=4 | | 4z+3=-9 | | 3.5k+5=12 | | s+-678=-6 | | s+60.4=90 | | 0.3(r+2)=–0.1(–2r–4 | | 4(b-3)=-32 | | −2x−6−9=34(8−16x) | | 7x+22-5x+6=100 | | 92+-2y+y=60 | | 4(x+4)+2x=56 | | 0.1x^2-0.8x=0.9 | | 42.3+n=90 | | -14-6-2x=-8x+10 | | v-36+v+v+43=180 | | 1x=57 | | 4w−3=13 | | –u=3u+8 | | x=20=40 | | q+61.4=90 | | 4x=10x-54 | | -2.5x+9-5.3x=4.2x-6(x-5/2) | | 1.3m-3=0.9 | | -7x(x+3)^2(5x-1)=0 | | -3x-9x(-2+6)+9=0 | | t+27.3=90 | | 3/37=40/y | | -27r=-702 | | 7/8m-1/2=3/16m+15 |