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Valery Boone
Mathematics
4 October, 04:49
If a=2i-3j-k and b=i+4j+2k what us ab
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Shyann
4 October, 05:18
0
2i²+5ij+3ik-12j²-10jk-2k²
Step-by-step explanation:
a=2i-3j-k
b=i+4j+2k
ab = (2i-3j-k) (i+4j+2k)
Multiply both bracket by expanding the bracket
2i (i+4j+2k) - 3j (i+4j+2k) - k (i+4j+2k)
Multiply
2i²+8ij+4ik-3ij-12j²-6jk-ik-4jk-2k²
Collect like terms
2i²+8ij-3ij+4ik-ik-12j²-6jk-4jk-2k²
2i²+5ij+3ik-12j²-10jk-2k²
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