Posted by **Noah** on Sunday, February 3, 2008 at 8:33pm.

I asked this question earlier and wasn't sure what the answer was. Find all numbers for which the rational expression is undefined?

3/9w+7

Can someone help me figure this out?

Is the answer 0?

- algebra -
**Damon**, Sunday, February 3, 2008 at 8:39pm
Please be careful about parentheses when using a keyboard

(3/9)w + 7 undefined for w=0

[3/(9w)] + 7 undefined for w = 0

3/(9w+7) undefined for w = -7/9

- algebra -
**Damon**, Sunday, February 3, 2008 at 9:03pm
you have to add them when using computer keyboard or we have trouble being sure what you mean

with no parentheses, you have to mean

[3/(9w)] + 7 by order of operations rules

- algebra -
**Damon**, Sunday, February 3, 2008 at 9:13pm
Whoa, I take that back

if there are no parentheses or other indication of what is numerator and what is denominator, you do the multipications and divisions left to right, and later additions and subtractions

(3/9) w + 7

never undefined

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