Originally Posted by

**ashleysmithd** Hi,

I'm really new to this, just trying to get my head around things.

I've been given the question: 1/sqrt(x) + 3x - x (I've attached a clearer jpeg version)

I'm using the formula: y' = b * ax ^b-1

I am getting the answer '3', through the following working out, however this does not correspond to the answer given by online derivative calculators.

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#1:

1/sqrt(x) + 3x - x

#2:

1/sqrt(x^1) + 3x^1 - x^1

#3:

1/sqrt(1x^1-1) + 1(3x^1-1) - 1x^1-1

#4:

1/sqrt(1x^0) + 1(3x^0) - 1x^0

#5:

1/sqrt(1) + 3 - 1

#6:

1 + 3 -1 = Ans 3

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Can anyone help me with this? Just need to know where or if I'm going wrong.

Thanks.

Daniel.