Posted by kim on Saturday, October 3, 2009 at 9:54pm.
Is f(x) sqrt(x+5) or (sqrtx) +5?
I think they mean sqrt (x+5), because is gives integer answers in some cases.
You can't take a square root of a negaive number.
Just plug in the indicated number for x and perform the calculation.
For (b), if x=11, then x + 5 = 15 and sqrt 16 = 4. They probably only want the positive square root.
I would just leave (d) as
sqrt (x + 5 + delta x)
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