If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-5x^2-15x-9=0
a = -5; b = -15; c = -9;
Δ = b2-4ac
Δ = -152-4·(-5)·(-9)
Δ = 45
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{45}=\sqrt{9*5}=\sqrt{9}*\sqrt{5}=3\sqrt{5}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-15)-3\sqrt{5}}{2*-5}=\frac{15-3\sqrt{5}}{-10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+3\sqrt{5}}{2*-5}=\frac{15+3\sqrt{5}}{-10} $
| 1/2(29-r)=7.75 | | 2.5x+8=-3.5 | | 2×(3a+5)=2×(a+15) | | D=4/3(m-38) | | t4− 17=-16 | | 1-3(2x-1)=-5x | | -(x-6)=2(3x-1) | | 100(1,5+10x)=-100 | | -15h+9=189 | | 4(x-1)=3(x-7)+1 | | -6a-7(6a-2)=322 | | 3(4+4x)=12x | | 118=1-7x | | 1.34*x=92 | | 2x+2=15-x+4 | | u/4+10=17 | | -5=y-7/9 | | -8k=-128 | | 7a+21=6a-40 | | -4s=-1 | | 130+0.50x=80+0.70x | | -2=5(2-x)+4x | | 2-5n=7n+6 | | 2(x+8)=-3(x-2) | | 90+0.60x=60+0.70x | | 65-+2x-10=180 | | 12-17y-5=7-17y | | 6(y+5)=2y+66 | | 16x=9x+28 | | w/3+9=31 | | 14+2+10n=7n-17 | | -1/2(-1)+7/2=1+a |