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R=square root of u squared plus v squared divided by m and u and v are positive.Find u when r=3,v=6 and m=5

  • Maths -

    the problem with language is it imprecise. That is why the French Academy in the 1700's went to symbols.

  • Maths -

    R = √(u^2+v^2)/m
    so, just plug in the numbers:
    3 = √(u^2+6^2)/5
    15 = √(u^2+36)
    Now square both sides to get
    u^2+36 = 225
    u^2 = 189
    u = ±√189 = ±3√21

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