Mohon bantu kak sama caranya​

Jawab:

Penjelasan dengan langkah-langkah:

vektor

13. a =(3,-2) dan b = (-1, 4)

a + 2b =  (3,- 2) + 2(-1, 4)

a + 2b = (3,- 2) + (-2, 8)

a+ 2b = (3 -2) +(-2 +8)

a+ 2b = (1 ,  6)

|a+ 2b| = √(1² +6²)= √37

14.  u = (2, 3, – 1)   dan v = (0 , 2 , 2)

vektor u + 2v =

= (2, 3, -1) + 2(0 ,2 ,2 )

= (2, 3, -1)  + (0 ,4 , 4 )

= (2 +0) , (3 + 4) ,(-1 + 4)

=  (2 , 7 , 3)

= 2i + 7j + 3k