If it's not what You are looking for type in the equation solver your own equation and let us solve it.
q^2=-81
We move all terms to the left:
q^2-(-81)=0
We add all the numbers together, and all the variables
q^2+81=0
a = 1; b = 0; c = +81;
Δ = b2-4ac
Δ = 02-4·1·81
Δ = -324
Delta is less than zero, so there is no solution for the equation
| v^2=-64 | | 2^x+4=-8x | | 2x+2x+4=-8x | | -18x+27=63 | | 1x+7=-4x+17 | | 2x+4=-8x | | 10+2(c-3=40 | | 7x-4=3x+3x | | (13c-8c)*9=90 | | (4x-2)=(-5x+5) | | 41u^2+45u=0 | | 4/x+13x=9 | | (9x+4)+(3x-2)+(3x-2)=180 | | 2A+2b=320 | | x+(x*0.11)=15000 | | 2(t+3)/3=3*t-8/2 | | 2+3h=10 | | x*1.15=283 | | -5w^2+32w=-12 | | y=-31/6+1 | | 3x5x4=(3x5)x4=3x(5x4) | | x+1=7x+32 | | 12x-2x+66=12x+38 | | 56/126=4x/9 | | X+27-6+x=50 | | 43x+81=180 | | (6x+13)+127=180 | | (6x+13)+127=170 | | 19x+5-70=180 | | 2x+7-5x=25 | | 12-5w=53 | | 144+2u+105+u+3=360 |