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89.6k views
in Mathematics by (52.9k points)

If two vectors a and b  are such that |vectors a|=2, |vectors b|=1 and vectors a . b=1, then find the value of  vectors (3a-5b).(2a+7b).

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by (266k points)
 
Best answer

Evaluating vector

Also, scalar product of vectors is commutative

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