Question

Resolva as equações.

A) x^2-9=0
B) 3x^2-75=0
C) x^2-2x=0
D) x^2-4x=0

Answer 1

a)

x² - 9 = 0
x² = 9
x = + ou - √9

x' = 3
x'' = -3

b)

3x² - 75 = 0
3x² = 75
x² = 75/3
x² = 25
x = + ou - √25

x' = 5
x'' = -5

c)

x² - 2x = 0
x.(x - 2) = 0

x' = 0

x - 2 = 0
x = 2

x'' = 2

d)

x² - 4x = 0

x.(x - 4) = 0

x' = 0

x - 4 = 0
x = 4

x'' = 4