If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x^2+16x+3900=0
a = 1; b = 16; c = +3900;
Δ = b2-4ac
Δ = 162-4·1·3900
Δ = -15344
Delta is less than zero, so there is no solution for the equation
| 19/x=5/78 | | 6x+7=3x+16= | | x+3/×+×/×+3=0 | | 6y-2=3y-4 | | x+3/×+×/×+3=39/40 | | 10^t=6 | | x*10=70 | | 2x+3=39/40 | | 8x+4=9x+7 | | 12x(3/x+2x/4)=7/3(12x) | | 9x+1=7+8x | | 6|x-1|=30 | | 2x=+23 | | 1.50x+10=0 | | -4k+2(5k-6)+3k=-39 | | 169/x=-13 | | -6(x+3)=-6x+10 | | 2x^2−11x+14=0 | | 2x+44/2=22 | | 10-5x=3(x-4)-292+7) | | (5u-8)(9+u)=0 | | 6x-10=7x+18 | | 7x+18=6x-10 | | 4-7-16=1+4x | | F(3)=7x+2 | | 3x-6÷2=7x-1÷5 | | -25+14c=-15 | | -6x-4=x+9 | | 35m+18.75=27m | | 35m+18.75=-27m | | 14x-5=21x+14 | | 60=3x^2+6x |