SOLUTION: can you please help me solve this? Identify the excluded values for each expression (7a^3b^2)/((21a^2b - 49ab)

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Question 72011: can you please help me solve this? Identify the excluded values for each expression
(7a^3b^2)/((21a^2b - 49ab)

Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Identify the excluded values for:
7a%5E3b%5E2%2F%2821a%5E2b-49ab%29
The excluded values for a and b are those values which would make the denominator = 0
It sometimes helps to simplify the expression first:
7ab%28a%5E2b%29%2F7ab%283a-7%29
Now you can see that if a or b = 0, then the denominator would be = 0, so a = 0 and b = 0 are excluded values...but wait...there may be more.
Looking at the factor in the denominator (3a-7) you can see that if a were = 7/3, then (3(7/3) - 7) = 0, so a = 7/3 is an excluded value.
So you have the excluded values:
a = 0 or 7/3 and
b = 0