Question

Tolong di bantu kk buat besok

Answer 1

Verified answer

Jawab

17.
|c | = a.b / |b|
8/3 = { m(4) - 12(2) -6(-4)] / √(4²+(2)² +(-4)²
8/3 = 4m/√36
12m = 8√36= 48
m  = 48/12
m = 4

18.

= (a.+b).b ) /|b|² .  (vektor b)

= (9,2,-4).(4,-4,2) / (4² +(-4)² +(2)²) . [4, -4 , 2]
= { 9(4) + 2(-4) - 4(2)} / (36)  [ 4, -4, 2]
= (36-8-8)/(36)  [ 4, -4, 2]
= (20/36)  [4, - 4, 2]
= 5/9 [ 4i-4j+2k]