hitung besar |a-b|

Ickien Almbanyoliewalkonyolie
Diket : |a|=4cm , |b|=2cm , dan |a+b|=2.V2 . Htung besar |a-b| ?

Brilly Maxel Salindeho ‎
|a+b|”= 8 = a” + b” + 2ab..
8 = 16 + 4 + 2ab, 2ab = -12..
|a-b|” = a” + b” – 2ab..
= 16+4 – (-12)=32,
So, |a-b| = V32..
Mohon yg lain, dikoreksi..🙂

 

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