If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-2x^2-12x+9=0
a = -2; b = -12; c = +9;
Δ = b2-4ac
Δ = -122-4·(-2)·9
Δ = 216
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{216}=\sqrt{36*6}=\sqrt{36}*\sqrt{6}=6\sqrt{6}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-6\sqrt{6}}{2*-2}=\frac{12-6\sqrt{6}}{-4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+6\sqrt{6}}{2*-2}=\frac{12+6\sqrt{6}}{-4} $
| 72/7x=-4 | | -9x/10=3 | | 8x-25=-37 | | 4(u-6)=2u-30 | | 24+5y=2 | | X+(x+10)+2x+20=210 | | x+.2x=329 | | x+.2x=300 | | -4(3t-2)+6t=4t-5 | | 100+x+12=x | | x(x+12)+100=180 | | 17=(-1/5x)+2 | | 13-x-12=10-x+15 | | 7(3+1)+X=5x-3-4x | | 2x-3x-4=11 | | 11x(8x+30)=180 | | 3(2x+10)=10 | | 3x+25=5x-35 | | 3(x+5)-2=-2(x-8)+3 | | X+(x+100)+2(x+100)=580 | | 7.2/x=1/25 | | 6x-3+4x=10x-6+3 | | 15^-3x=12 | | 2x/6+x/5=2/3-x/5 | | 14(y-3)-12(y+6)=4 | | -2(5x-9)=2x-6 | | 9w-17w=64 | | 1/9-5/3x=-1/x | | 9-2z=2-z | | -7x+14=70 | | 6x+8−2x=−7x−17+x6x+8−2x=−7x−17+x | | x(1/4)-13x(1/2)+12=0 |