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Efectuati folosind formula (a+b)(a-b)=a2-b2
a). (x+2)(x-2)
b). (a+3)(a-3)
c). (5+x)(5-x)


Răspuns :

(x+2)(x-2)=x²-4
(a+3)(a-3)=a²-9
(5+x)(5-x)=25-x²