Question

$frac{a^3-4a}{a+2} = 0$

Answer 1

$frac{a^3-4a}{a+2}=0; ; Rightarrow ; ; left { {{a^2-4a=0} atop {a+2ne 0}} right. ; left { {{a(a-2)(a+2)=0} atop {ane -2}} right. ; left { {{a=0,a=-2,a=2} atop {ane -2}} right. \\Otvet:; ; a=0,; a=2.$