What two numbers add up to 5 but multiply to get -4.
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To find the magnitude of a vector, take the components, square them, then add them, then take the square root. This is very similar to the Pythagorean Theorem.
For your particular problem, I’ve included a picture showing how that specific calculation is done. :)
For your particular problem, I’ve included a picture showing how that specific calculation is done. :)