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
----------------#----------------
Semoga Bermanfaat
Jangan lupa komentar & sarannya
Email: nanangnurulhidayat@gmail.com
Kunjungi terus: masdayat.net OK! 😁
Post a Comment for "Jika |a| = 4, |b| = 6, dan |a + b| = 8, tentukan nilai |a – b| = "