Diketahui a = 7i – pj + k dan b = 4i + 2j + 6k. dimana a.b = 12 Hitunglah nilai p!

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A.b = 12
a (7i – pj + k)               
b (4i + 2j + 6k)
a.b = 12
(7 x 4)i  (-1p x 2)j (1 x 6)k = 12  28 -2p + 6 = 1234 – 2p = 12-2p = 12 – 34-2p = -22p = 11
Lalu coba masukan nilai p(7 x 4)i – (11 x 2)j + (1 x 6)k = 12 
28 – 22 + 6 = 126 + 6 = 1212 = 12

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