If it's not what You are looking for type in the equation solver your own equation and let us solve it.
9x^2=-91
We move all terms to the left:
9x^2-(-91)=0
We add all the numbers together, and all the variables
9x^2+91=0
a = 9; b = 0; c = +91;
Δ = b2-4ac
Δ = 02-4·9·91
Δ = -3276
Delta is less than zero, so there is no solution for the equation
| 5=4(n+3)/2 | | -13x+12=13x-12 | | 1y+4-20+24y=-50 | | 12x+12=13-13 | | 10(2.1x+0.6=17.4) | | -4x+11(5)=15 | | 8x+98=35x | | 14g=14+12g | | -14.7q+7.21=16.39 | | 10-5x=×-2 | | -18-10h=18-8h | | 2x(4x+3)+1=0 | | -14=-7(u–8) | | 122.081939696=x | | 3a–6a=15 | | x+1=2×-7 | | ‐(8y+4)=8‐5y+132 | | -254=-10x-2-8x | | 3x+10=3×-28 | | 0.42x=0.52x-4.55 | | (-2.3)(3x-4)+3x=5.6 | | (3x-2)/5=31 | | 7n-12=2n+3 | | (13x-5)=90 | | -5+2y=9 | | (19x-1)=90 | | 7=4(2-2x)+3 | | 4x+97=773 | | 244=140-x | | 4–3g=16 | | 2x+6x-5=50 | | 2(x-5)=6x+70 |