maksimgelmud7
03.10.2019 •
Mathematics
Find v × w if v = 3i + 8j – 6k and w = –4i – 2j – 3k.
a. –2i + 8j – 3k
b. –36i + 33j + 26k
c. 33i + 26j + 8k
d. 3i – 2j + 8k
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Ответ:
Using the determinant method, the cross product is
so the answer is B.
Or you can apply the properties of the cross product. By distributivity, we have
(3i + 8j - 6k) x (-4i - 2j - 3k)
= -12(i x i) - 32(j x i) + 24(k x i) - 6(i x j) - 16(j x j) + 12(k x j) - 9(i x k) - 24(j x k) + 18(k x k)
Now recall that
(i x i) = (j x j) = (k x k) = 0 (the zero vector)(i x j) = k(j x k) = i(k x i) = j(a x b) = -(b x a) for any two vectors a and bPutting these rules together, we get
(3i + 8j - 6k) x (-4i - 2j - 3k)
= -32(-k) + 24j - 6k + 12(-i) - 9(-j) - 24i
= (-12 - 24)i + (24 + 9)j + (32 - 6)k
= -36i + 33j + 26k
Ответ:
i have no cluse sorry
Step-by-step explanation: