a = -i + j - k
b = 2i + 8k
-3a + 4b = -3(-i + j - k) + 4(2i + 8k)
= 3i - 3j + 3k + 8i + 32k
= 11i - 3j + 35k
c = 3i + j - 3k
a. a + b + c = -i + j - k + 2i + 8k + 3i + j - 3k
= 4i + 2j + 4k
b. 3a - 2b + 4c = 3(-i + j - k) - 2(2i + 8k) + 4(3i + j - 3k)
= -3i + 3j - 3k - 4i - 16k + 12i + 4j - 12k
= 5i + 7j - 31k
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nomor 1
a = -i + j - k
b = 2i + 8k
-3a + 4b = -3(-i + j - k) + 4(2i + 8k)
= 3i - 3j + 3k + 8i + 32k
= 11i - 3j + 35k
nomor 2
a = -i + j - k
b = 2i + 8k
c = 3i + j - 3k
a. a + b + c = -i + j - k + 2i + 8k + 3i + j - 3k
= 4i + 2j + 4k
b. 3a - 2b + 4c = 3(-i + j - k) - 2(2i + 8k) + 4(3i + j - 3k)
= -3i + 3j - 3k - 4i - 16k + 12i + 4j - 12k
= 5i + 7j - 31k