Given a = 2i + 4j – k and b= 3i – 2j+4k. Find (a - b) × (a+b). A. -i+6j- 5k В. 28i — 22] — 32k C. 5i + 2j+ 3k D. -28i + 22j +32k

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A: solution:-a→=i→+2j→-3k→b→=-2i→-j→+5k→(1)a→+b→=i→+2j→-3k→+-2i→-j→+5k→         =1-2i→+2-1j→+-3+5k→…

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