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PRE CAL Let a = 2i + 9j, b = –4i + 5j, c = i – 3j, and d = 14j where i and j are unit vectors. What is (a – b) – (2d – c) in terms of i and j? 5i – 27j 5i + 35j 7i – 27j 7i + 39j
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Dec 15, 2021
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PRE CAL
Let a = 2i + 9j, b = –4i + 5j, c = i – 3j, and d = 14j where i and j are unit vectors.
What is (a – b) – (2d – c) in terms of i and j?
5i – 27j
5i + 35j
7i – 27j
7i + 39j
Mathematics
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Gorio
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Answer:
C
Explanation:
EDGE
Attila Tanyi
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Dec 16, 2021
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Attila Tanyi
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Answer:
7i - 27j
Explanation:
Given
a = 2i + 9j, b = –4i + 5j, c = i – 3j, d = 14j
To find
(a – b) – (2d – c)
Solution
(a – b) – (2d – c) =
2i + 9j - (–4i + 5j) - (2(14j) - (i – 3j)) =
2i + 9j + 4i - 5j - 28j + i - 3j =
(2 + 4 + 1)i + (9 - 5 - 28 - 3)j =
7i + (-27)j =
7i - 27j
Anna Christine
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Dec 19, 2021
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Anna Christine
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