Troubles with a proposed solution path in a 'finding directional derivates' exercise (multivariable calculus) – Khan Academy Help Center - Hungarian (BETA)

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Kosephah Okieveze

2023. május 20. 8:24
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Hello,

I have troubles understanding how to arrive at certain steps in the proposed solution path.

Here is the question:

And here is the step I have troubles comprehending:

Can you please explain why the third term is 2h^2/4 while the last term is sqrt(2)h^2/4?

And how do get from there to here:

Kind regards

Kosephah

P.S. a formula editor would be nice to have here ;)

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cossine

2023. május 24. 11:11
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Hi what you are describing is mistake on Khan Academy end. It is best you report question like this. There should have been button to do so.

Can you please explain why the third term is 2h^2/4 while the last term is sqrt(2)h^2/4?

You are correct the last term should have been 2h^2/4

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