Question

1- Calcule as raízes
2
a)X - 9= 0

2
b)X - 9x= 0

Answer 1

a)
x² - 9 = 0
x² = 9
x = √9
x = +/- 3

R.: x = 3 e x = -3

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b)
x² - 9x = 0
x.(x - 9) = 0
x = 0

x - 9 = 0
x = 9

R.: x = 0 e x = 9