Jawaban:

7. vektor yang saling invers adalah vektor yang besarnya sama tapi arahnya berlawanan

vektor yang saling invers => gambar d

8. diket: a = (-2, 0)

b = (2, 3)

|ab| = √(2+2)²+(3-0)²

= √16+9

= √25 => 5 (opsi b)

9. diket: q = (-3)

(3√2)

|q| = √(-3)²+(3√2)²

= √9+9x2

= √9+18

= √27 => 3√3 (opsi b)

10. diket: a = (x, y)

b = (3, 3)

c = (-2, 1)

d = (2, 2)

ab = (7, 6)

11. diket: titik pangkal p = (6, 4)

titik ujung q = (2, 1)

pq = q-p

= (2-6) (1-4)

= (-4, -3)

|pq| = √(-4)²+(-3)²

= √16+9

= √25 => 5

jadi vektor satuannya adalah

(-4/5) (-3/5) => opsi b

12. diket: a = (8, 6)

b = (2, 4)

a.b = (8.2) (6.4)

= (16, 24)

=> 40 (opsi b)

13. c = a+b

c = (6) + (2)

(2) (4)

= (6+2)

(2+4)

= (8, 6)

|c| = √8²+6²

= √64+36

= √100 => 10 (opsi e)

semoga membantu

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