Tolong dibantu dijawab soalnya kk
a) 11i+20j
b) 9i–10j
Penjelasan dengan langkah-langkah:
a) 3a–c
= 3(5i+5j) – 4i+5j
= 15i+15j – 4i+5j
= 11i+20j
b) a + (b–2c)
= 5i+5j + (4i–5j – 2{4i+5j})
= 5i+5j + (4i–5j – 8i+10j)
= 5i+5j + (–4i–15j)
= 5i+5j + 4i–15j