1º Ano A e B

Olá amigos.

Novamente estamos discutindo o assunto tão tenebroso para alguns: Equação do 2 grau.

Vamos fazer alguns exercícios de fixação? Quanto mais, melhor!

Bom estudo!!

1. Resolva as seguintes equações do 2º grau, sendo o conjunto U = R:

a) x² + 7x = 0                                                                           S = {0, -7}

b) -3x² + 9x = 0                                                                        S = {0, 3}

c) 2x² + 3x = 0                                                                         S = {0, 3/2}

d) (y + 5)² = 2x + 25                                                                S = {0, - 8}

d) x² + 9x = 0                                                                           S = {0,-9 }

e) (y + 5)(y – 1) = 2y – 5                                                          S = {0, - 2}

e) y² – 10 = 0                                                                           S = { }

f) 2x² + 50 = 0                                                                          S = { }

g) -5r² + 20 = 0                                                                         S = {-2, 2}

h) 9a² = 25                                                                               S = {-5/3, 5/3}

i) (b + 6)(b – 4) = 2b + 12                                                         S = {-6, 6}

j)  5y²- 9y – 2 = 0                                                                      S = {2, -1/3}

k) x² – 9x + 20 = 0                                                                    S = {4, 5}

l) y² + 9y + 14 = 0                                                                     S = {-2, -7}

m) b² – 3b – 10 = 0                                                                  S = {-2, 3}

n) 2y² + 7y + 6 = 0                                                                    S = {-2, -3/2}

o) 4y² – 4y + 2 = 0                                                                    S = { }

p) 5t² – 9t + 4 = 0                                                                      S = {1, 4/5}