SOLUTION: Hello, i have this problem Find a*b a = 2i-j , b = j-3k I've tried this so far: 2i-j*j-3k = 2i-3k-j I feel like this is so wrong. I'd appreciate an explanation on how

SOLUTION: Hello, i have this problem Find ab a = 2i-j , b = j-3k I've tried this so far: 2i-jj-3k = 2i-3k-j I feel like this is so wrong. I'd appreciate an explanation on how

Question 972955: Hello, i have this problem
Find a*b
a = 2i-j , b = j-3k
I've tried this so far: 2i-j*j-3k = 2i-3k-j
I feel like this is so wrong.
I'd appreciate an explanation on how to handle vectors with an "i", "j", "k" etc behind them. Also, what are these called?
Thanks

Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

Find
if and , then
recall the rule for multiplication of binomials:

1. multiply each term in one binomial by each term in the other binomial
2. add those answers together, and simplify if needed

so, you have:

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