(5i+5j+4K).(2i-7j+3k)
Matematika
andri471
Pertanyaan
(5i+5j+4K).(2i-7j+3k)
1 Jawaban
-
1. Jawaban isnani18
(5i + 5j + 4k) . (2i - 7j + 3k)
= 5i(2i) + 5j(-7j) + 4k(3k)
= 10i² - 35j² + 12k²
= 10(1) - 35(1) + 12(1)
= 10 - 35 + 12
= - 13