Mohon dibantu menjawab ! Terimakasih :)

3.
a. tentukan
 5a - 3b + 2c  =
= 5(-3,2) - 3(3, -5) + 2(-5,-6)
= (-15, 10) - (9, -15) + (-10, -12)
= {(-15 -9 -10),(10 +15-12)}
= {-34, 13}
...

4. p (-1,3, -2)  , q = (2, 1, -3)
a (4,2,3)   b(2, -2, 5)
a. b = {(4x2)+ 2(-2)+ 3(5)}
a.b = 8- 4 + 15
a.b = 19

5.
p = -1, 3, -2  --> |p|= √(1+9+4)= √14
q = 2, 1, -3 --> |q| = √(4+1+9) = √14

p.q = -1(2) +  3(1) -2(-3) = -2 + 3 + 6 = 7

cos (p,q) = p .q  /|p||q| = (7)/{√14)(√14) = 7/14 = 1/2
<(p,q) = arc cos (1/2) = 60°