If l a l = 3, | b | = 4 and la-bi=5then what is the value of | a + b | – InterviewSolution

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1.

If l a l = 3, | b | = 4 and la-bi=5then what is the value of | a + b |?(a) 8(b) 6(c) 5v2(d) 5

Answer»

| a-b| = √a²+b²-2abcos∅ = 5

=> 9+16 -2*3*4cos∅ = 25=> cos∅ = 0

so, |a+b| = √a²+b² +2abcos(90) = √25 = 5

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