If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a2-9a-4=0
We add all the numbers together, and all the variables
a^2-9a-4=0
a = 1; b = -9; c = -4;
Δ = b2-4ac
Δ = -92-4·1·(-4)
Δ = 97
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-\sqrt{97}}{2*1}=\frac{9-\sqrt{97}}{2} $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{97}}{2*1}=\frac{9+\sqrt{97}}{2} $
| 1+5b-6=-25 | | 8-2x=-25 | | X-7=56-13(x+7) | | 13v-10v-v=20 | | 3x+35=140 | | 2.4=24.8-7y | | 9x+17=11x+15 | | 5(3x-5)=4(2x+1) | | 5x+(-5x)=10 | | -5u-16=-8(u-1) | | 2x+4=0.666(3x+9)-8 | | 42-21x+12x=51 | | 2/e =6 | | 9a=4a-8a | | {x-3}{2}=4 | | a-30+2a+30=180 | | 12x-3=187 | | 3y=8-12y/4+2 | | 3(x+3)+2x=4(1-2x)+12x | | -3|x-1|-12=9 | | 10x+4-2=6x+9+7 | | -7=-2-2(-13+v) | | 4x+1=(x-2) | | 3(x+3)+2x=4(1-2x+12x | | 4/5m-1/3=2/7 | | 4x^=2x+4 | | -8(-5x-2)=456 | | (3x-6)2+x=30 | | |2y+5|=10 | | 3(x−76)=63 | | x+6+4x=-1+5x | | 2q=27 |