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Algebra-still need some help

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Homework Help Forum: Algebra
Posted by Jena on Thursday, February 3, 2011 at 7:32pm.


Find the domain of the function.
f(x)=(sqrt x+6)/(-2x-5)

Write your answer as an interval or union of intervals.



Algebra - David, Thursday, February 3, 2011 at 7:42pm
(-6,-5/2)and(-5/2,infinity)



Algebra - Reiny, Thursday, February 3, 2011 at 7:46pm
the simplest way to describe the domain:

x ? -6 , x ? -5/2



Algebra - Jena, Thursday, February 3, 2011 at 7:52pm
I'm lost

  • Algebra-still need some help -

    For the domain, the denominator can't equal zero.

    -2x - 5 = 0
    -2x = 5
    x = -5/2

    So, x cannot equal -5/2
    All x not equal to -5/2

    For the numerator, you cannot have a negative inside the square root.

    x + 6 >= 0
    x >= -6

    All x >= -6

  • Algebra-still need some help -

    I get
    (-inf,-5/2)U[-6,infin) but it doesn't look right

  • Algebra-still need some help -

    Is this a question?

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