panjang vector u=12i+3j-4k adalah.....

VEKTOR

|u| = akar(12^2 + 3^2 + (-4)^2)
|u| = akar(144+9+16)
|u| = akar169
|u| = 13 satuan panjang

panjang vektor
= akar 12²+3²+(-4)²
= akar 169
= 13