Here's the question you clicked on:
nickersia
If |8i-j|=|7i+kj| (vectors), find two possible values for k belongs to R. Answers: +4, -4. How?
becasue it is asking for the length of the vectors to be equal
@amistre64 I need step by step how to do it... I undestand why it is +4 and -4
\[8^2+1^2=7^2+k^2\] \[8^2+1^2-7^2=k^2\]
Oooooooooh my God! It's that simple! Thank you very much!