1. Wyznacz dziedzine funkcji f oraz jej miejsca zerowe f(x)= log₃(x²+x+1)
D:
x^2 + x + 1 > 0
delta = 1 - 4 = -3
D = R
log3 (x^2 + x +1) = 0
log3 (x^2 + x+ 1) = log3 3^0
x^2 + x + 1 = 1
x^2 + x + 1 - 1 = 0
x^2 + x = 0
x(x + 1) = 0
x = 0 lub x + 1 = 0
x = 0 lub x = -1
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D:
x^2 + x + 1 > 0
delta = 1 - 4 = -3
D = R
log3 (x^2 + x +1) = 0
log3 (x^2 + x+ 1) = log3 3^0
x^2 + x + 1 = 1
x^2 + x + 1 - 1 = 0
x^2 + x = 0
x(x + 1) = 0
x = 0 lub x + 1 = 0
x = 0 lub x = -1