Determine the magnitude of the difference of the following vectors: u - v u = 7i - 12j v = -2i + j

Hi there! 
ANSWER: 15.81
First we must find the difference of u and v: (7i-12j)-(-2i+j)
Distributed all out this equals: 9i-13j
We can then go ahead and use Pythagorean therm to find the magnitude: v = Square root of (9)^2 + (-13)^2 
This equals Square root of 250
Depending on the form your teacher wants to answer in it would finally be 5 square roots of 10 or in decimal form; approximately 15.8114
Hope this Helps! :)