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valkas [14]
3 years ago
7

If a=2i-3j-k and b=i+4j+2k what us ab​

Mathematics
1 answer:
Masteriza [31]3 years ago
8 0

Answer:

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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