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Ajutor dau coroana.
1.Descompuneti in factori expresia : x^2 - 10x - y^2 + 25
2.Calculați : -2(x-2)=-12


Răspuns :

1)
[tex] x^{2} -5x-5x+25- y^{2} =x(x-5)-5(x-5)- y^{2} =[/tex]
=(x-5)(x-5)-[tex] y^{2} [/tex]
=[tex] (x-5)^{2} - y^{2} [/tex]

2)
x-2=6
x=8
2.
-2x+4= -12
-2x= -12-4
-2x=   -16
x= 8