If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-2t^2-20t-30=0
a = -2; b = -20; c = -30;
Δ = b2-4ac
Δ = -202-4·(-2)·(-30)
Δ = 160
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{160}=\sqrt{16*10}=\sqrt{16}*\sqrt{10}=4\sqrt{10}$$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-20)-4\sqrt{10}}{2*-2}=\frac{20-4\sqrt{10}}{-4} $$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-20)+4\sqrt{10}}{2*-2}=\frac{20+4\sqrt{10}}{-4} $
| x-9=-2+3 | | 11^-3y=2 | | x/3+x/2=7/9 | | 3x-26=-2x+54 | | 3/4p=1/5 | | x^2-2x+384=0 | | 10=(3^x+5)-2 | | -7b−7=-6b | | -6v+1=1−6v | | -6h+10h=4h | | -9+7q=6q | | 9r+9=9r | | 40,000-2x=0 | | x2=−81 | | 36w-5=1.8 | | -3^2-36t-100=0 | | -2t^2-36t-100=0 | | x=40/5 | | (s+6)(s-2)=0 | | 2t^2-20t-30=0 | | x^2-2x+396=0 | | -7x;=x-10 | | 3y−8=−5y+16 | | -(t-1)=-12×3 | | f(-1)=4-3 | | 2(w-9)=7w-33 | | n+0.3=-4.1 | | (5(x-10))/2+14=19 | | (4w-5)(2+w)=0 | | 5x+2×=21 | | x-(.05X)=193.80 | | W=100+5(h-60) |