# math..solve for u again.

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• math..solve for u again. -

What part of my work don't you understand?

u - √2 = 3

u - 1.414 = 3

u = 4.414

• math..solve for u again. -

• math..solve for u again. -

sorry. u-2√u=3

• yes, 9 is right -

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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