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If 2 vectors chati-5hatj+6hatkand chati+...

If 2 vectors `chati-5hatj+6hatkand chati+chatj-4hatk` are perpendicular to each other, and c is given to be a positive integer, find its value.

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The correct Answer is:
[0008]
`c^(2)-5c-24=0`
`c=(5+-sqrt(25+96))/(2)=(5+-11)/(2)=-3,8" ""]"`
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