The sentence to translate is this:
- Do not do this, lest you should seem to be a coward.
My effort: Hoc noli facere, ne ignavus esse videaris.
But the key says: Ne hoc feceris. . . .
Is Hoc noli facere correct Latin for a negative command?
Are Hoc noli facere and Ne hoc feceris interchangeable in this context?
truks
2
Yes, the usual way of expressing negative second-person commands is with ne + perfect subjunctive or with noli + an infinitive.
This info is presented under ‘rule 10’ on page 60 of N&H. 
Thanks truks! My N&H is paginated differently, but thanks to your citing “rule 10” I found it easily.