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x-1≠0
x≠1
x-4≠0
x≠4
D:x∈R\{1;4}
f(x) = (x + 6)/(x - 1)(x + 4)
D : (x - 1)(x + 4) ≠ 0
x - 1 ≠ 0 ∧ x + 4 ≠ 0
x ≠ 1 ∧ x ≠ - 4
D : x ∈ R \ { - 4, 1 }
Miejsce zerowe funkcji:
f(x) = 0
(x + 6)/(x - 1)(x + 4) = 0 /* (x - 1)(x + 4)
x + 6 = 0
x = - 6
b)f(x)=x² -7
√1/2x -5