If it's not what You are looking for type in the equation solver your own equation and let us solve it.
z^4+z^2+20=0
We do not support ezpression: z^4
| 11k+42=13k+2k+8 | | x.10.4=324.48 | | 36v^2-180v-56=0 | | 3x+3(-2+12)=66 | | -6(4x+3)=-5x+39 | | 224a+120=183a+407 | | +4x-1=2x-2 | | 0.5c+13=3c+48 | | -13=n/5-10 | | 0.10=-t/873.36-2.15 | | 0.12x=0.37 | | 12=8+x/3 | | 14d+4=9d+22+d | | 4z-2/6=5 | | 4c+5+2c=3c+17 | | +4x-1=+2x-2 | | 77+-1x=167=-10x | | 20x+15=45-30 | | v/15-5=-4 | | 2-2s=3/4(s)+13 | | v/3+1.1=-5.9 | | 6u+2=90+14 | | 2(x+2)=3(2x-4) | | 2w-1+8=62w-4 | | v-144=195 | | (3y-7)^2=50 | | 3u+2-u=2u-1+5 | | 45*4-5y=45 | | 4x+3/9+7x-6/4=12 | | 2u+4u=-19 | | -33.174=3.74x+4.6 | | 1/4(x+2)=x-7 |