Obtenha o vértice de cada uma das parábolas representativas das funções quadráticas :?
a) y = x² - 6x + 4
b) y = -2x - x
c) y = x² - 9
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a) y = x² - 6x + 4
b) y = -2x - x
c) y = x² - 9
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c) y = x² - 9
y = (x - 3)(x+3)
V=(3;-3)