(√123)² - (5√4)² The options are; 123 - 25 · 4 = 23, 123 - 25 · 2 = 73, 123 - 5 · 2 = 113, Can't solve it and all of the answers
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For 
to be continuous at 
, we need to have
Note that
means that 
, but that 
is *approaching* 5. We're told that for , we have
We can write
and the limit would be
and so is discontinuous.
Note that
We can write
and the limit would be
and so