Question

2) DETERMINE o valor de x:
a) x²= 9
b) x²= 25
c) x²= 49
d) x²= 81

Answer 1

Resposta:

a) x² = 9

   x = √9

   x = 3

b) x² - 25 = 0

   x² = 25

   x = ± √25

   x = ± 5

   S = {-5, 5}

c) x² - 49 = 0

   x² = 49

   x = ± 49

   x = ± 7

   S = {-7, 7}

d) x² = 81

   x = √81

   x = 9