Răspunsuri

2014-04-15T13:59:48+03:00
A)(x-2)(x+2)=4-(x+1)(x-1)
   x*x-4=4-(x*x-1)
   x*x-4=4-x*x+1
   2*x*x=9 
   x*x=9/2 =>x=rad(9/2)=+3rad(2)/2 sau x=-3rad(2)/2

b)x(x+6)+3x(x-2)=36
   x*x+6x+3x*x-6x=36
  4x*x=36
   x*x=9 => x=3 sau x=-3

c)x(x+1)+(x+2)(x+3)=3(2x+26)
   x*x+x+x*x+3*x+2*x+6=6*x+78
  2*x*x+6*x-6*x=72
  2*x*x=72
  x*x=36
  x=6 sau x=-6
multumesc
am o intrebare ce sunt stelutele alea deasupra la z
x pardon
* inseamna inmultire
ok ms