Nearly, but not quite.

First of all there is no variable. When you write you should be writing .

Your is correct however (what should be) your is not.

The previous value, from , is two (not zero).

Therefore you should have

.

This in turn makes your Heun approximation wrong… you correctly have the two for the slope at the previous point,

but ‘magic’ up

,

when you should have used (which you, incorrectly, had).

Of course we see from above that so what you should have had is:

,

and also

.

It remains to find and, the final answer, (you are not asked to approximate ).

Regards,

J.P.

Just wondering could you give me a hand with Written Assessment 2. Have you done a solution out for the test? I am stuck on Q.2, can you tell me if I’m going the right way or not, little confused about this, and which formulas to use. I’ve attached the question and my attempt, much appreciated if you can tell me.

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