If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
(x^2-4)^2 = 0
(x^2-4)^2 = 0
(x^2-4)^2 = 0
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in (-oo:-2) U (-2:2) U (2:+oo)
(8*x)/((x^2-4)^2) = 0
8*x = 0 // : 8
x = 0
x = 0
| 8x-41=4x+75 | | a+26=35 | | 2(x-4)+5=3x-1 | | n^2=-18+9n | | y^2+x^2=8 | | (5x-3)(7x-4)= | | x+(-5x)=8 | | 2x+3.6=9.2 | | 72+12n=52 | | 104=y-67 | | 4+2a=3(a-2)+1 | | ln(x^2-1)-2ln(x-1)=ln(2) | | (40x^2-20x^2)/2x^5 | | b^2=-13b-40 | | 9x-2(x-7)=7(x+1)+5 | | 9m=-38+38 | | -18=2n | | 12=w+(-4) | | 3-1/2x=1/4 | | 1/2x=7/3 | | 8x+12(x-3)=100 | | 4+2s=3(s-6)+1 | | 2x-1/x-5 | | 5y-6=3y+8 | | 3x+14=-14-5x | | 0.06(8x-1)=0.48(x+7)-3.42 | | 2h=29 | | 60=9q-3+7p | | .50(x+.33)-.2=5 | | 0.3q-0.06+0.2q=q+0.3 | | 6x-6=-5x | | -2d-1.7=-3.7 |