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12 May, 08:47

Find α given that 5i+4j and αj-3k have the same length.

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  1. 12 May, 09:11
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    5^2+4^2=a^2 + (-3) ^2

    25+16=a^2+9

    a^2=41-9=32

    a=4√2

    is answer.
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