Question

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

Answer 1

1)
$x^{2} -5x-5x+25- y^{2} =x(x-5)-5(x-5)- y^{2} =$
=(x-5)(x-5)-$y^{2}$
=$(x-5)^{2} - y^{2}$

2)
x-2=6
x=8

Answer 2

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