diketahui vektor a = (-4, -2, 2) dan b = (5, -1, 4) proyeksi vektor ortogonal vektor a pada vektor b adalah

a.b/|b|^2 .b =
(-4 -2 2) (5 -1 4)/ √5^2+(-1)^2+4^2 . (5 -1 4)=
(-20+2+8)/|√42| . (5 -1 4)=
-10/42 .(5 -1 4)=
-5/21 .(5 -1 4)=
(-25/21i 5/21j -20/21k)=
(-1 4/21i 5/21j -20/21k)=
-1 4/21i+5/21j-20/21k