if A=i-2j+4k and B=2i-j+2k then magnitude of AxB?
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B 8 3
A × B = i ^ 3 2 j ^ 1 −3 k ^ 2 4 =(1×4−2×−2) i ^ +(2×2−4×3) j ^ +(3×2−1×2) k ^ =8
i ^ −8 j ^ −8 k ^ ∴ Magnitude of A × B =∣ A × B ∣= (8) 2 +(−8) 2 +(−8) 2
=8 3
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