If $\vec B$ is added to $\vec A$, the result is 4.8i + 1.2j. If $\vec B$ is subtracted from $\vec A$ , the result is −3.20 + 5.8j. What is the magnitude of $\vec A$?
Am I supposed to subtract the two, so 8i - 4.6j? But then how would I find A's magnitude? To find magnitude, I would need to multiply direction, length, and a random choice of either sin or cos. BUt I can't do that with the data I have.