Homework Help: Algebra-still need some help

Posted by Jena on Thursday, February 3, 2011 at 8:43pm.

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 - helper, Thursday, February 3, 2011 at 9:18pm
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 - Jena, Thursday, February 3, 2011 at 9:23pm
I get
(-inf,-5/2)U[-6,infin) but it doesn't look right
Algebra-still need some help - helper, Thursday, February 3, 2011 at 9:43pm
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