Equação Do 2 Grau.doc

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Equação do 2º Grau Exemplos: 

resolução da equação: Temos

Δ = 132 – 4.7.-2 Δ = 169 + 56 Δ = 225 X=

 13  225  13  15  13  15 2 1     2.7 14 14 14 7

 13  15  28   2 14 14

EXERCÍCIOS 1. Resolva as equações completas no conjunto R: a) x2 - x - 20 = 0

b) x2 - 3x -4 = 0

c) x2 - 8x + 7 = 0

d) 2x² + 7x + 5 = 0

3x² + x + 2 = 0