Respostas

2013-04-02T19:20:15-03:00

a) f(2) = 2² - 5.2 = 4 - 10 = -6

 

b) f(-2) = (-2)² -5.-2 = 4 + 10 = 14

 

c) f(2+x) = (2+x)² -5.(2 + x) = 2² + 2.2.x + x² - 10 - 5x = 4 + 4x + x² - 10 - 5x = x² - x -6

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