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December 2019
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Resolva:
A) (x+2)^2=4
B) (x-3)^2=9
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exalunosp
A
( x + 2)² = 4
(x)² + 2.2.x + 2² = 4 ou x² + 4x + 4= 4
x² + 4x + 4 - = 0
x² + 4x = 0
x( x + 4) = 0
x = 0 ***
x + 4 = 0
x = -4 ****
b
( x - 3)² = 9
(x)² - 2.3 .x + 3² = 9
x² - 6x + 9 - 9 = 0
x² - 6x = 0
x( x - 6) = 0
x = 0 ***
x - 6 = 0
x = 6 ****
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Lista de comentários
( x + 2)² = 4
(x)² + 2.2.x + 2² = 4 ou x² + 4x + 4= 4
x² + 4x + 4 - = 0
x² + 4x = 0
x( x + 4) = 0
x = 0 ***
x + 4 = 0
x = -4 ****
b
( x - 3)² = 9
(x)² - 2.3 .x + 3² = 9
x² - 6x + 9 - 9 = 0
x² - 6x = 0
x( x - 6) = 0
x = 0 ***
x - 6 = 0
x = 6 ****