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Verified answer
Bab FungsiMatematika SMA Kelas X
f(x) = √(x² + 4x + 6)
terdefinisi jika f(x) ≥ 0
x² + 4x + 6 ≥ 0
a = 1; b = 4; c = 6
D = b² - 4ac
= 4² - 4 . 1 . 6
= 16 - 24
= -8
karena D < 0, maka hasilnya tidak real, sehingga Df nya himpunan kosong
Df = { }