Răspunsuri

2014-06-10T17:30:03+03:00
A. x2=48+1 X2=49(aplici radicalul) si este X=7
2014-06-10T17:32:59+03:00
A) x²=48+1
x²=49
x1=-7 si x2=7

b) 5.5=36x.x
36x²=25
x²=25/36
x1=-5/6 si x2=5/6

c) 4x²-4x+y²+6y+10=0
4x²+4x+1 +y²+6y+9=0
(2x+1)²+(y+3)²=0
2x+1=0
x=-1/2
y+3=0
y=-3