Posted by **John** on Tuesday, February 19, 2013 at 7:37am.

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 -
**bobpursley**, Tuesday, February 19, 2013 at 8:50am
the problem with language is it imprecise. That is why the French Academy in the 1700's went to symbols.

- Maths -
**Steve**, Tuesday, February 19, 2013 at 11:50am
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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