Răspunsuri

2014-09-10T18:16:50+03:00
4x²-7=9

4x²=9+7

4x²=16 |:4

x²=4 

√x²= √4

|x|=2  => x={-2;2}
  • Utilizator Brainly
2014-09-10T18:19:19+03:00