Question

A)|5i vector-j vector|,|2jvector+3j vector|

Answer 1

|ai+bj|=$\sqrt{ a^{2} + b^{2} }$
A) |...|=$\sqrt{ (5)^{2} + (-1)^{2} }$=$\sqrt{ 25+1 }$=$\sqrt{ 26 }$B) |..|=|5j|=$\sqrt{ (5)^{2} }$=5