Answer:
Step-by-step explanation:
First, I really dislike the use of i and j as variables here, both of these variable are mainly reserved for complex numbers where [tex]\sqrt{-1}[/tex] = i Yes, you really can take the square root of a negative number but nobody tells you that till much much later. Hence why i and j are special variables. That aside, just solve this by plugging in each of the values into their repsective variable in the last expression. :)
u = -7i + 8j
v = 10i + 7j
w = 11i - 8j
u + 2v - w
plugging in
-7i+8j +2(10i+7j) - 11i-8j
distribut in the 2
-7i+8j +20i + 14j - 11i -8j
now put all the like variables together
2i +14j
there is your answer. what was difficult about this, btw ??
