Posted by **Kyle** on Saturday, October 13, 2012 at 6:11pm.

u-2√u=3. what is u?

- Math -
**bobpursley**, Saturday, October 13, 2012 at 7:36pm
change u to x^2, then sqrtu = x

x^2-2x-3=0

(x-3)(x+1)=0

x=3, or u= + 9

x=-1, or u=+ 1

checking

u=9

9-2*3=3 checks

u= i

1-2 does not equal 3, does not check.

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