Question

|A+B|= 2,| A|= 5 , |B| =3 then what is | A-B|

Answer 1

Answer: Given that,

|A+B|=2

Squaring on both sides,

|A+B|²=4

|A|²+|B|²+2(a.b)=4

25+9+2(a.b)=4

2(a.b)=-30

(a.b)=-15

Now, |A-B|=|A|²+|B|²-2(a.b)=34+30=64

Explanation:

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