If it's not what You are looking for type in the equation solver your own equation and let us solve it.
9x^2=-900
We move all terms to the left:
9x^2-(-900)=0
We add all the numbers together, and all the variables
9x^2+900=0
a = 9; b = 0; c = +900;
Δ = b2-4ac
Δ = 02-4·9·900
Δ = -32400
Delta is less than zero, so there is no solution for the equation
| 3s+-49=32 | | 8h+6=3+7 | | 12+6m=72 | | x+(x-x0,89)=6 | | 17=23-3b | | m/10=2 | | 18x-6=4(6x-2) | | x+(x-x0,89)=6,0 | | 0.05n+0.10D=2.40 | | 6n-3=-93 | | x+x0,89=6,0 | | 3x-8=7x-80 | | x0,89+x=6 | | 7r+7=13+6r | | 2x+3x=40+x | | 1/3(12x-3)=3 | | x1,1+36=223 | | 12-3x=8x-4 | | -117/x=-79 | | 116 = q + 79 | | x1,01+36=223 | | x1,01+12=223 | | 12+x1,01=223 | | 3(2x-7)=2(3x+9) | | x+27+101=180 | | 12+x1,1=223 | | 76=(1/2)x+1/3(x)-(1/5)x | | ((8.2+x)/2)=6 | | x1,1+12=223 | | 76=2x+3x-5X | | 2m+8/5=8 | | 8.2+x=6 |