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If |8i-j|=|7i+kj| (vectors), find two possible values for k belongs to R. Answers: +4, -4. How?

Mathematics
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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
\[8^2+1^2=7^2+k^2\] \[8^2+1^2-7^2=k^2\]

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Oooooooooh my God! It's that simple! Thank you very much!
youre welcome

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