Question

Stabiliti care dintre urmatoarele propozitii sunt adevarate penru orice valoare a numerelor reale X


1.(x-5) (x+5)=(x-5)^2


2.(x-√3) (x-√3)=x^-9


3.(7-x) (7+x)=x^2-49


4.(√2+x) (√2-x)=2-x^2


5.(x-2) (x+2)^=(x^2-4)^2


6.(x+5)^2 (x-5)=x^4-50x^2+625


7.(x+1)^2-(x-1)^2=[(x+1) (x-1)]^2

DAU COROANA!! e urgentttttttttttttttttttttttttttt

Answer 1

Răspuns:

X²-25 ;  F ;  2)   X²-3 ; F ;  3)   X²-49 ; A ;  4)  2-X² ;  A

Explicație pas cu pas:

²