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Jika |a| = 4, |b| = 6, dan |a + b| = 8, tentukan nilai |a – b| =

Jika |a| = 4, |b| = 6, dan |a + b| = 8, tentukan nilai |a – b| = …. 

Pembahasan:

|a + b|2 = |a|2 + 2ab + |b|2

|a – b|2 = |a|2 – 2ab + |b|2. +

|a + b|2 + |a – b|2 = 2|a|2 + 2|b|2

|a – b|2 = 2|a|2 + 2|b|2 – |a + b|2

            = 2 . 42 + 2 . 62 – 82

            = 32 + 72 – 64

|a – b|2 = 40

|a – b| = √40

|a – b| = 2√10

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