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2013-12-10T22:08:42-02:00
Y = x² - 4x + m
5 = 2² - 4.2 + m 
m = 5 - 4 + 8 
m = 9 
2013-12-10T22:32:32-02:00
5=2-4.2+m
5=2-8+m
5-2=-8+m
3=-8+m
3+8=m
11=m