Respostas

  • Usuário do Brainly
2014-05-22T09:25:54-03:00
7x² +2 =30
7x²=30-2
7x²=28
x²=28/7
x²=4
x=Raíz de 4 e -4
2 3 2
2014-05-22T09:43:02-03:00
7x² +2 =30
7x² =30 -2
7x² =28
 = 28/7
x² = 4
x = + ou - √4
x = + ou - 2

{+2,-2}