Q. 134.2( 46 Votes )

The scalar produc

Answer :

Given: given vectors are

Then sum of vector is given by the resultant of .


Let the sum is .


Then





Then magnitude of is :





Scalar product of






Square on both sides:


(λ + 6)2 = (λ)2 + 4λ + 44


(λ)2 + 12λ + 36 =(λ)2 + 4λ + 44


8λ = 8


λ = 1


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