ANITA ESTUDO DIRIGIDO II 
Autor: Luciana Moura - Bióloga | Publicado: 2013-06-09T11:42:00-07:00

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ANITA - 9º ANO ESTUDO DIRIGIDO II 

1) Quais das equações abaixo
são do 2º grau? 

a) x² + 3x – 1 =
0 b) 5x + 3x – 2 = 0 c) 5x² – 100 = 0 

d) x³ + 5x² – 1
=0 e) 3x² + 5x = 0 f) x – 3x + 1 = 0 

2) Determinar os valores dos
coeficientes a,b e c nas equações: 

a) a) 5x² – 8x + 5
= 0 b) 4x² – 16 = 0 c) x² + 5x = 0 

d) 7x² = 0
e) 3x² – 2x – 1 = 0 f) x² + 3x + 6 = 0

3)Verificar se os valores
indicados para x são raízes das equações: 

a) x² - 49 = 0 para x = 7 e x =
-7 b) x² -3x = 0 para x = 0 e x = 3 

c) x² - 1 =
0 para x = 0 e x =-1 d) x² - 7x = 0 para x = 1e x = 7

4)Resolver as equações do 2º
grau: 

a) x² - x - 12 = 0 b) 3x² - 8x +
10 = 0 c) 2x² + 5x + 4 = 0 d) 2x² + 5x – 3 = 0 

e) x² - 6x
+9 = 0 f) x² + 6x – 16 = 0 g) 3x² - 7x + 2 = 0 h) x² -9 x
+ 8 = 0



** TRAZER RESPONDIDO NO DIA&nbsp; 12/06/2013**