Determine o dominio ou campo de existencia das funcoes?
a)f(x)=log 2 (x-8)
b)f(x)=log x (x²-1)
c)log 3 (x²-5x+6)
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a)f(x)=log 2 (x-8)
b)f(x)=log x (x²-1)
c)log 3 (x²-5x+6)
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A) x- 8 > 0 <=> x > 8 => Dom(f) = ] 8, + infinito [
B) (x² -1) > 0 e x > 0 e x diferente 1 => Dom(f) = ] 1, + infinito [
C) x² - 5x + 6 > 0 => Dom(f) = ] - infinito, 2 [ U [ 3, + infinito [