SOLUTION: Dear sir, i got stuck on this home work problem, please help me "If u = −2i + 4j, v = 3i + 2j, w = 4i + 6j then |u + v + w| is a) 5 b) 13 c) 4 d) 15

Algebra ->  Matrices-and-determiminant -> SOLUTION: Dear sir, i got stuck on this home work problem, please help me "If u = −2i + 4j, v = 3i + 2j, w = 4i + 6j then |u + v + w| is a) 5 b) 13 c) 4 d) 15       Log On


   

Question 397775: Dear sir, i got stuck on this home work problem, please help me
"If u = −2i + 4j, v = 3i + 2j, w = 4i + 6j then |u + v + w| is
a) 5
b) 13
c) 4
d) 15
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
u +v + w = -2i + 4j + 3i + 2j + 4i + 6j = 5i + 12j.
Then abs%28u++%2Bv+%2B+w%29++=+abs%28+5i++%2B+12j%29+=+sqrt%285%5E2+%2B+12%5E2%29+=+13.
So the answer is b.