book Maths Puzzle Numerical Ability

-4/c2 - d/c

the c2 is c squared.

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book Other Question

The teacher is asking me to simplify this complex fraction.
1
----- +1
a
--------
1
---- -1
a

I am struggling with this problem so any help is appreciated. How do you write in the form of y=a(x-p)2+q from y=x2-6x+10?