Yes it is a short sentence
Answer:

Explanation:
Given

Required
Determine the directrix
First, we express the equation in form:

Where the directrix is:

So, we have:

Rewrite as:

Multiply the right hand side by 4/4


By comparison:
and 



The directrix is calculated as:

So:


Answer:
What do you need help with on this sentence?
Explanation:
Answer: They don't believe that they're smart enough or mentally strong enough to achieve something