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(x^2-4)(9-x^2)=0
x apartine Z


Răspuns :

[tex]\rm (x^2-4)(9-x^2)=0 \\ (x+2)(x-2)(3+x)(3-x)=0 \\ x+2=0 \longrightarrow x=-2 \\ x-2=0 \longrightarrow x-2 \\ x+3=0 \longrightarrow x=-3 \\ 3-x=0 \longrightarrow x=3[/tex]