Question

ex 4 a,c dau coroana ajutor

Answer 1

a)x^2-25diferit de 0
(x-5)(x+5) diferit de 0
x-5 dif de 0
x diferit de 5
x+5 diferit de 0
x dif de -5
R\{+-5}
b)F(x)=x^2-7x+10/x^2-25
=(x^2-2x-5x+10)/(x-5)(x+5)
=x(x-2)-5(x-2)/(x-5)(x+5)
= (x-2)(x-5)/(x-5)(x+5)
=x-2/x+5
c)F(x)=2
x-2/x+5=2
x-2=2(x+5)
x-2=2x+10
x=-2-10
x=-12
verif :-12-2/-12+5=-14/-7=2

Answer 2

 Am atasat o rezolvare !