A=2i-3j+k and b=5i+j-k find the dot and cross product
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Answer:
a.b = 6
a×b = 2i+7j+17k
Step-by-step explanation:
Dot product
a.b = 2×5 + -3×1 + 1×-1 = 10-3-1=6
Cross product
a×b = (-3×-1 - 1×1)i + (1×5 - 2×-1)j + (2×1 - -3×5)k
=(3-1)i + (5+2)j + (2+15)k
=2i+7j+17k
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