Posted by **jasmin** on Saturday, October 13, 2012 at 5:43pm.

u-2√2=3. please show work

- math..solve for u again. -
**Ms. Sue**, Saturday, October 13, 2012 at 5:50pm
What part of my work don't you understand?

u - √2 = 3

u - 1.414 = 3

u = 4.414

- math..solve for u again. -
**jasmin**, Saturday, October 13, 2012 at 6:00pm
the answer should be 9

- math..solve for u again. -
**jasmin**, Saturday, October 13, 2012 at 6:01pm
sorry. u-2√u=3

- yes, 9 is right -
**Damon**, Saturday, October 13, 2012 at 8:06pm
let x = sqrt u

then

x^2 - 2 x = 3

x^2 - 2 x - 3 = -

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

x = 3 or x = -1

try sqrt u = 3 then u = 9

9 - 6 = 3 Yes

try sqrt u = -3 , that is an imaginary number, forget it

so

u = 9

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