If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( k )
k^3 = 0
k^3 = 0
k^3 = 0
1*k^3 = 0 // : 1
k^3 = 0
k = 0
k in (-oo:0) U (0:+oo)
1-(8/(k^3)) = 0
1-8*k^-3 = 0
-8*k^-3 = -1 // : -8
k^-3 = 1/8
-3 < 0
1/(k^3) = 1/8 // * k^3
1 = 1/8*k^3 // : 1/8
8 = k^3
k^3 = 8 // ^ 1/3
k = 2
k = 2
| n+(-6)=22 | | 444=2(8-4w)+2w | | 153+n=17 | | 2/7y-8=11 | | 15-(x+7)=7x-8 | | 7/8-9/-8/2 | | 90+n=18 | | (2x-5)squared=255 | | x^2+20-y^2-9x-4y+21-8x+6y-2=3-4y-5x-2y^2 | | y=lntan(π/4-x/2) | | 81x^20-16y^8=0 | | 91+(-7)=n | | 126+n=9 | | 20-3y(2+2y)=1 | | y=cosh(2x-1) | | 4x-15(12)=1 | | 7x+19=5(x+3) | | 50w-w^2=0 | | 4x-3y(2+2y)=1 | | 2p^2+8p=p^2+5p+10 | | -125+5=n | | 5(x-1/2)=7/2 | | 4x-3y(x-2y+2)= | | 420+(-15)=n | | 3x+10x-10=0 | | 11x+3y=53 | | 81c^12-d^20=0 | | 4(x+5)=33 | | X-(-6)=6 | | (-1)+x=7 | | -5x+4=3(x-4) | | (x^4)-(7x^3)=0 |