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January 29, 2015

January 29, 2015

Posted by **Anonymous** on Sunday, January 16, 2011 at 7:22pm.

u=-u+6

- algebra -
**helper**, Sunday, January 16, 2011 at 7:38pmdo you mean

u = (sqrt(-6 + u))

please use the word 'sqrt' and put in ()

what is included under the radical

we will be able to assist you much faster if what you need is more clear

thank you

- algebra -
**helper**, Sunday, January 16, 2011 at 7:56pmu = (sqrt(-u + 6))

u = (sqrt(6 - u))

square both sides

u^2 = 6 - u

u^2 + u - 6

complete the square

u^2 + u = 6

u^2 + u + 1/4 = 6 + 1/4

(u + 1/2)^2 = 25/4

take the square root of both sides

+ - (u + 1/2) = 5/2

u + 1/2 = 5/2

u = 4/2 = 2

-u - 1/2 = 5/2

-u = 6/2 = 3

u = -3

check for u = 2

u = (sqrt(6 - u))

2 = (sqrt(6 - 2))

2 = sqrt 4

2 = 2

check for u = -3

u = (sqrt(6 - u))

-3 = (sqrt(6 + 3))

-3 = sqrt 9

-3 not = 3

so, the only solution is u = 2

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