For this case we have that by definition:

So:

We apply distributive property that states that:

In addition, we take into account that:


Answer:

Option B
Answer:
Step-by-step explanation:
explain how to do this more
Answer:
x = 4
Step-by-step explanation:
a = i-2j
b = 2i-xj
1 = k•2
-2 = k•(-x)
=> 1/2 = k
=> (-2)/(-x) = k
=> 1/2 = (-2)/(-x) => 1/2 = 2/x => x = 4