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21fizika

1) 9-х²≠0; х≠3;  х≠-3

2) х²-4х≥0;

х(х-4)≥0;  х(х-4)=0; х=0 или х=4

///////    ////////                   ///////////////

------(-3)------[0]------(3)----[4]------>x

 +          +          -         -         +      

x∈(-∞; -3)U(-3; 0]U[4; ∞)    последний вариант.

Из области (-∞; 0]U[4; ∞) вырезали (-3).

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