Question

find |vector d + vector e| given that |vector d|=3 and |vector e| = 5 where the angle between these two vector is 50 degrees.

Answer 1

is it 18.4

Answer 2

the answer is 7.30 :( but i dont knw how to get it

Answer 3

nw mine is cmng 13.9

Answer 4

what did you do ?

Answer 5

i did |d+e|^2=|d|^2+|e|^2
+2|d||e|cos
|d+e|^2=25+9+30*50pi/180
|d+e|^2=34+5.23
=39.23
|d+e|^2=39.23
|d+e|=6.2

Answer 6

i got it :) ! you just caclulated the cos value wronge :) ! but thanks alot i got the idea from your solution :) !