1.

If |a|=5, |b|6 and a.b=-25, then |axxb| is equal to

Answer»

25
`6sqrt(11)`
`11sqrt5`
`5sqrt(11)`

SOLUTION :Now ,` |axxb|^2+(a.b)^2=|a|^2|b|^2`
`RARR |axxb|^2=25xx36-(25)^2`
`=25(36-25)=25xx11`
`rArr |axxb|=5sqrt(11)`


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