Função do 2º grau ou Função quadratica

Esboce o gráfico da função -3


1º Encontraremos o ponto do vertesse da parábola, usando as formulas:


a= 1, b= 2, c= – 3


Agora escolhemos valores de x de modo que xv e yv sejam os valores centrais, observe:

x

y= x2 + 2x – 3

y

(x,y)

-3

y= (-3)2+2(-3)-3

0

(-3,0)

-2

y= (-2)2+2(-2)-3

-3

(-2,-3)

-1

 

- 4

(-1,4)

0

y= (0)2+2(0)-3

-3

(0,-3)

1

y= (1)2+2(1)-3

0

(1,0)

 

Esboçando o gráfico:


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About Edimar Gomes Santiago

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