Question

- 21. Resolva as equações a seguir.
a) x2 - 4 = 0
d) x2 + 4 = 0
b) x2 – 9 = 0
e) x2 + 9 = 0
c) x² - 10=0
f) x2 + 10 = 0 ​

Answer 1

Resposta:

a) x² - 4 = 0

x² = 4

x = $\sqrt{4}$

x = 2

d) x² + 4 = 0

x² = -4

x = $\sqrt{-4}$

x = ∄

b) x² – 9 = 0

x² = 9

x = $\sqrt{9}$

x = 3

e) x² + 9 = 0

x² = -9

x = $\sqrt{-9}$

x = ∄

c) x² - 10=0

x² = 10

x = $\sqrt{10}$

x = 3,162

f) x² + 10 = 0 ​

x² = -10

x = $\sqrt{-10}$

x = ∄