Question

Rezolvati ecuatia de mai jos din poza

Answer 1

Elimininam numitorii
Ecuatia devine:
(y-2)(-y+7)=y+1
-y patrat+7y+2y-14=y+1
y patrat-8y+15=0
(y-4) la patrat -1=0
(y-4) la patrat=1
y-4=+1
y=5
y-4=-1
y=3

Answer 2

y+1/y-2=-y+7 amplificam pe -y+7cu y-2 y+1=(y-2)(-y+7) y+1=y^2+7y+2y-14 y+1-y^2-9y+14=0 -y^2-8y+14=0 a=-1 b=-8 c=14 delta=-8^2-4•(-1)•14=64+56=100 radical din delelta=10 X1=8-10/2•(-1)=-2/-2=1 X2=8+10/-2=20/-2=-10