Respostas

2014-05-12T18:54:02-03:00
X2 -121=0
x2 = 121
x=+-(simbolo da raiz quadrada)121=0
x=+-11
S={-11,+11}
2014-05-12T19:12:18-03:00
X² - 121 = 0
x² = 0 + 121
x² = 121
x =+√121
x = +11
S = {+11}