A=2i+3j,B=i+j-k,find A×B
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Answer:
2i²+5ij+3j²
Explanation:
A=2i+3j
B=i+j
A*B=?
=(2i+3j)*(i+j)
=2i(i+j)+ 3j(i+j)
=(2i*i+2i*j) + (3j*i+3j*j)
=2i²+2ji+3ij+3j²
=2i²+5ij+3j²
Ans- 2i²+5ij+3j²
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