Respostas

2013-05-30T21:38:22-03:00

x' =2

x''= -8

 

x²-6x-16=0

 

-6x                                        -16   

-6                                        2*-8= -16

2-8=-6

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2013-05-30T21:42:46-03:00

x²-6x-16=0

 

a = 1

b = -6

c = -16

 

b² - 4ac

 

-6² - 4.1x.- 16

36 - (-64)

36 + 64

100

 

Delta=100

 

(-b + ou - raiz de Delta)/2.a

 

(-(-6) + ou - raiz de 100)/2.1

 

(6 + ou - 10)/2

 

x=(6+10)/2= 8

 

x'=(6-10)/2 = -2

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