Question

If (vector) |A|=7 and (vector) |B|=11 and (vector) |A+B|=8, then what is |A-B| equal to?​

Answer 1

Answer:

Hey !

Explanation:

Since |A+B| = 8, A^2+B^2+2A.B = 64 => 49+121+2A.B= 64

Since |A+B| = 8, A^2+B^2+2A.B = 64 => 49+121+2A.B= 642A.B= 64–170=-106 => A^2+B^2-2A.B =49+121+106 =276

Since |A+B| = 8, A^2+B^2+2A.B = 64 => 49+121+2A.B= 642A.B= 64–170=-106 => A^2+B^2-2A.B =49+121+106 =276|A+B| = sqrt(276)

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