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Jawabannya c. -4Jawaban terlampir di gambar
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Kode : 12.2.4 [Kelas 12 Matematika BAB 4 - Vektor]Penyelesaian
Titik-titik
A(3, -2, 4)
B(1, 3, -2)
C(x, 2, 4)
Vektor AC = vektor OC - vektor OA
Vektor AB = vektor OB - vektor OA
|AC| = |AB|
Kuadratkan kedua ruas
x² - 6x + 25 = 65
x² - 6x - 40 = 0
(x - 10)(x + 4) = 0
Diperoleh nilai x = -4 atau x = 10.
Jawaban yang tersedia adalah C. -4.