Question

If a=3i-7j and b=5i+2j, find a-b

A.2i-9j
B.2i-5j
C.8i-5j
D.8i-9j

Please explain how you solve this because i am confused

Answer 1

- 2i - 9j

Explanation:

a - b

= 3i - 7j - (5i + 2j) ← distribute

= 3i - 7j - 5i - 2j ← collect like terms

= - 2i - 9j

None of the answers on your list