A=7i-2j+3k. B=-4i-2j+6k find A.B and A×B
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Step-by-step explanation:
A=7i-2j+3k. B=-4i-2j+6k
A×B=(7i-2j+3k)×(-4i-2j+6k )
=7i(-4i-2j+6k )-2j(-4i-2j+6k )+3k(-4i-2j+6k )
= -28i^2-14ij+42ik+8ij+4j^2-12jk-12ik-6jk+18k^2
A×B = -28i^2+4j^2+18k^2-6ij+30ik-18jk
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