Q8 of 256 Page 6

If and , verify that |AB| = |A| |B|.



Now |A|= 2 × 1 – 2 × 5


|A|= 2 – 10


|A|= –8


Now |B|= 4 × 5 – 2 × (–3)


|B|= 20 + 6


|B|= 26


⇒ |A|×|B|= –8 × 26


|A|×|B|= –208


Now






|AB| = 18 × (–1) – 19 × 10


|AB| = –18 – 190


|AB| = –208


Hence |AB| =|A|×|B|.


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