If it's not what You are looking for type in the equation solver your own equation and let us solve it.
X2+15X+30=0
We add all the numbers together, and all the variables
X^2+15X+30=0
a = 1; b = 15; c = +30;
Δ = b2-4ac
Δ = 152-4·1·30
Δ = 105
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{-(15)-\sqrt{105}}{2*1}=\frac{-15-\sqrt{105}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(15)+\sqrt{105}}{2*1}=\frac{-15+\sqrt{105}}{2} $
| 10+31=4x+17-2x-8x | | 4b-7+9b=27 | | 4(x-5)=3(x+1)=7 | | -4c+15=-35 | | -16=4/7u | | 2x+2(13.75x)=55 | | -4c+15=35 | | 2t+7,t=15 | | 89=21+4k | | -8-2/7x=4/7+4x | | (3x-15)=100 | | 4(u+12)=68 | | 7x-9+5-3x=-12 | | -10=2c+1 | | t/7+31=35 | | –6–6z=–9z+15 | | 1.38x^2-x-5=0 | | 5a+14-2a-9=31 | | 18-d=7 | | 3−2=7−x | | 3(5x-1)=138 | | 12a+8-6a=2(3a)+8 | | 4x+3-6-2x=8 | | (5x+21)(7x−3)=0 | | 8x-2+126=180 | | 2x^2)+98=180 | | -5a+4=-14 | | c-29=41 | | 40–9y=–5y | | 2(7-2(1-n))+8n=-6+3(6(n+1)-3n) | | 8=m-5/9 | | 7^x-12=18 |