Jawab penting!!!. bangettttttt

Jawab penting!!!. bangettttttt

No 2a
$(13a - 8b) + (21a + 9b) \ = 13a - 8b + 21a + 9b \ = (13 + 21)a + ( - 8 + 9)b \ = 34a + b$
no 2b
$(15i - 14j + 13k) + ( - 30i - 45j + 51k) \ = (15 + (- 30))i + ( - 14 + (- 45))j + (13 + 51)k \ - 15i + ( - 59)j + 64k \ - 15i - 59j + 64k$
no 2c
$(3x - 17y + 35z) + (4x + 23y - 9z) \ = (3 + 4)x + ( - 17 + 23)y + (3 - 9)z \ = 7x + 6y - 6z$
maaf jika salah