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Theyounglion
a fost răspuns

descompuneti in factori:

4x²-81=  ; 
25-9x²=    ;
(x-1)²-16=  ;
9-(x+2)²=   ;
9x²-(2x-3)²

Răspuns :

Alitta
...=(2x+9)(2x-9) ;
...=(5+3x)(5-3x) ;
...=(x-1+4)(x-1-4)=(x+3)(x-5) ;
...=(9-x-2)(9+x+2)=(7-x)(11+x) ;
...=(3x+2x-3)(3x-2x+3)=(5x-3)(x+3) ;

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